Help a noob with Ryu Please

Hey there SRK users,
I was just wondering if anyone could please give me some tips to playing Ryu. I am new to fighting games and have been told Ryu is good for begginers. I am currently playing through his challenges and sometimes finding them tough… Any advice???
Also i am wondering if anyone could please explain what each of Ryu’s moves do E.G. Anti airs, Knock downs, ect.
Finally could someone give me some siple yet effective combos i could practice to improve my game.
Also i thought i would quickly mention that i am using and xbox 360 controller xD

Thanks for the advice

Almost everything you need can be found here Ryu General Discussion: Frame Data, Strategy, Combo, etc