Welcome to Gaia! ::

Everyone NEEDS to download at least these two books:

http://www.4shared.com/file/78153445/6ad6af67/Players_Handbook__4e_.html?s=1

http://www.4shared.com/file/146067985/81f10782/DD_4E_Players_Handbook_2.html?s=1

These are the core player handbooks. If you wish to get more intricate than the basics, here's a few more supplements.

Adventurer's vault contains a big list of magical items; this will come in handy later, although you may wish to look through now to get some ideas of what may be fun if you find it.

http://www.4shared.com/file/105679540/ea70ec9c/Adventurers_Vault__4e_.html?s=1

http://www.4shared.com/file/203224447/8e900f4c/DD_4E_Adventurers_Vault_2_-_Be.html?s=1

Divine Power, for you divine classes:
http://www.4shared.com/file/119843622/497f0541/4E_Divine_Power_now_with_OCR__.html?s=1

Arcane power, for the arcane classes:
http://www.4shared.com/file/105680306/9caa2844/Arcane_Power__4e_.html?s=1

Primal power, for the primal classes (druid warden):
http://www.4shared.com/file/197863349/77268a2c/DD_4E_Primal_Power.html?s=1

Martial Power, for the martial classes (fighter, ranger):
http://www.4shared.com/file/105687538/c965128b/Martial_Power__4e_.html?s=1