If you've only been playing 2 weeks then honestly what you need most is practice. Blasters are one of the trickiest archetypes to play, and Fire/Fire is one of the hardest Blaster combinations because you have no mitigation whatsoever, just damage. No high end build will substitute for learning things like which enemies to hit first, when to fall back and regroup, and which enemies have stuns or holds... you know, all that stuff Brute and Scrapper players never have to bother with. 
I would suggest sticking to a basic build using SOs, common IOs, and a few cheap set IOs (don't worry about set bonuses yet, just go for really cheap uncommon (yellow) recipes that enhance two or three aspects of a power (like accuracy/damage/endurance IOs). Once you get a feel for the character and play him/her a while you can decide if you actually want to stick with it (again, Fire/Fire is hard mode and not everyone will enjoy it)... if you do then you can save up some inf and start on a higher end build.
Cascade, level 50 Blaster (NRG/NRG since before it was cool)
Mechmeister, level 50 Bots / Traps MM
FAR too many non-50 alts to name
[u]Arcs[u]
The Scavenger Hunt: 187076
The Instant Lair Delivery Service: 206636
To get through the low levels with your endurance bar and sanity intact, pick one favorite single target attack. This does not have to be "the best" minmax optimized DPS attack, and in fact probably shouldn't be. Just pick a power you think is fun. For example, I might pick Flares or Ring of Fire or Fire Blast, but really, any early single target damage attack will do.
Now, slot that power for Dmg, Accuracy, and EndRedux before slotting any other single target damage powers. (Slotting non-damage powers like Aim, Build Up, and Stamina is ok. Slotting up one AoE power is also ok.) This power will be your designated DPE power. That way, when endurance runs low, you're still capable of using your most endurance efficient attack continuously, perhaps even getting net positive recovery as you spam this efficient attack. (If this reminds you of a certain other superhero MMO, then you get the picture.)
Once you got your DPE power slotted, DOs will be available and you can start working on becoming a DPS monster. Now start slotting up those DPS beasts like Fire Sword and Blaze and AoE attacks: Dmg, Accuracy, and Recharge (and Range, in Fire Breath). You won't be able to use these attacks continuously, but if you use them strategically for when burst damage is crucial, falling back to your DPE attack for cleanup, you'll have no problems getting to that oh-so-important level 22 and cheap SOs.
Once you get SOs, you can have your cake and eat it too. You can start slotting all your best attacks for both recharge and end redux. And you have more endurance coming in from Stamina as well. No respec needed, just overwrite your old DOs with a more varied mix of SOs and cheap IOs: damage, accuracy, recharge, endredux (and Range, in Fire Breath).
You may also want to take a few sessions to slow down and observe buff/debuffing in this game. Good teamwork with a buff/debuffer is often the difference between facerolling every spawn with hardly a dip in your end bar, or debt drama and despair. Simple tactics like pulling around corners, saving the debuff-anchored enemy til last, and not fearing melee when you've got support, work miracles at low levels.
Drop Acc, Damage, and End on your favorite attack, and learn to shoot while pressing the A and D keys. 
Hi there... I want a bit of your help here ... I am in game 2 weeks and i dont know what is going on about builds... My toon is Fire/Fire magic blaster ... Can anyone tell me the most powerfull and most expensive build? Or what my blaster need most? Damage? softcaping?