How do I commentate my Gamming?

Well i dont have a mic or a head set but i have my Ipod headphones and i think it has a mic so im using that as my mic for now. The headphones ill worry about later. What programs do i use for recording? I want to make youtube videos of my gaming (not that im good just for the fun) because i watch A guy named syndicate commentate his gamming and it looks fun. Im going to record on my DELL desktop Games like League of legends and Combat Arms and possibly Minecraft. But i have no idea how. Will my mic automatically Put my voice into the film or do i have to somehow edit it into there? What Program is the best to use for recording? (Free one? possibly? I'm only 15) I tried recording Using the Combatarms Built in Fraps but the quality is horrible. (Bloodymkc youtube) How can i have good commentating footage and post it on youtube? How is the Film Saved? Im such a NOOB X_X