needs help

how to inprove it and if i should have it be r-w or r-w-b

There are millions of different decks out there and the answers for your question depend on some points:
What legality do you want this deck to be built for? At the moment it's nearly standard, the only card ruining that would be "Izzet Guildgate". if you want to play on a beginners tournament or FNM then it will have to be standard legal. If you want to play with your friends then it will either be modern or 'use what you have' aka kitchen table. Should this deck be competitive or do you just want to play with your friends?
What strategy do you want this deck to have? At the moment it looks like an aggressive and fast built that focuses on the 'prowess' ability of many creatures.
Are you willing to buy/ trade for new cards and what is the budget for new cards (per card or for all cards)?

And last, have you already played this deck and ran into some problems with it? If yes, what where those problems.

i think im going red white and i only need 3 cards plus this is for standard

i will fix the deck and then you can tell me what you think ok?
Thanks

this is the deck that I'm thinking of using what do you think of it?

OK, so the target is a standard R/W agro deck that focuses on prowess. Removing the U (blue) part may have lowered the chance of getting through your opponents defenses but we will take a look at that.

First I would change some numbers:
+1 "Bloodfire Expert"...good and aggressive, especially when combined with evasion or trample
Sideboard "Seeker of the Way" and increase to 4...I don't know the decks that re around standard at the moment but lifgain is an option I would always put into my sideboard and use when needed.
Remove "Student of Ojutai"..."Seeker of the Way" is the better choice here and were putting that one into your sideboard
+ 1-2 "Zada, Hedron Grinder"...tough the copies don't count for the prowess ability he's still a very strong supporter. Legendary, though don't use more than 3 of him in a deck.
That would be it for he creatures, now to the support spells.

I would concentrate on some cheap buff and protection spells here, and perhaps some removal.
+ 1-2 "Artful Maneuver"...with rebound it fits perfectly into a prowess deck.
-1 "Kindled Fury"...to get room for "Defiant Strike"
+2 "Defiant Strike"...+1/+0 doesn't sound to good but it allows you to draw an additional card and that can be worth it
-1 "Temur Battle Rage"...finisher, 3 should be enough
+1 "Titan's Strength"...best cheap buff spell red has to offer at the moment
-2 "Trumpet Blast"...I would concentrate on cheap spells that buff one creature.
-1 "Lightform"...lifegain, either remove or sideboard
-1 "Myth Realized"...with only one copy it's not consistent enough. If you draw and play it e.g. on T4 it will be hard to make a valuable 'creature' out of this. Also it doesn't benefit from prowess
+ 1-3 "Feat of Resistance" or "Center Soul"...protection will always be important. One the one hand you can protect your creatures from getting shot away, one the other hand you can help them to get through your opponents defense. A creature with protection from white can't be targeted by white spells (this also counts for your own spells) but it also cant be blocked or damaged by white creatures your opponent controls!

I hope I was able to help you a little bit.

Why do you think "Myth Realized" would trigger prowess?
Prowess is activated by non-creature SPELLS, activating "Myth Realized" uses its ABILITY, big difference. So the only time this card triggers a prowess ability is when it's cast, and thus enters the battlefield.
Worse, activating wouldn't even trigger enter the battlefield-effects because the card is already on the field. It just changes it's form.

its not a creature and it dosen't say that i equip it to one

or am i being stupid?

Lightform will trigger prowess, as well as Myth Realized will, when it enters the battlefield. But that's it then.
Myth Realized gets a lore counter whenever you cast a noncreature spell and you then can pay {W} to tun it into a creature until end of turn, but the 'transformation' itself won't trigger prowess effects.
The same is true for the card manifested with lightform. You activate the ability of the face-down card, gained by lightform. But thats an ability and no spell is cast here.

The 2W when i put one on would count/ the first ability would count as a non-creature spell

It's not a spell. You're paying the activation cost for an activated activity. They're 2 different things.

"Lightform": The casting of this spell (one colorless and two white mana) counts for prowess.
The 'manifest' ability reads like this: "To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.". So the card you manifest isn't cast it's just put into play, thus no activation of prowess.

"Myth Realized": The casting of this spell (one white mana) counts for prowess.
The first ability puts a lore (not a +1/+1!) counter on the enchantment. It's an ability and thus doesn't count for prowess.
The second ability changes the type of the card from enchantment to creature. It's an ability and thus doesn't count for prowess.
"Myth Realized" is already on the battlefield, it just changes it's type, so no "enter the battlefield" effects will be activated.

If you want to know more about casting spells, ability's in general, special ability's like deathtouch and so on (prowess wasn't added when I recently checked), you should take a look at the complete magic rules book.
There are 2 different versions, one short version for beginners (http://media.wizards.com/images/magic/resources/rules/EN_MTGM14_Rulebook_LR.pdf) and a full version for all those who want/ need to dig deeper into the rules (http://media.wizards.com/images/magic/tcg/resources/rules/MagicCompRules_20140601.pdf).
Both links belong to a PDF file from the official magic website. The link to the site would be http://archive.wizards.com/Magic/tcg/article.aspx?x=magic/rules

ok i will look at that thanks