please help (big papa or anyone)

aight, bare with me, Im new to this. Ive read lots of big papas posts , but i still dont understand.

ok first. whats the difference between bootable and nonbootable, and which one would be the one you buy from a dealer.
what is the best program to use to burn games that you dont need the boot disk for.,
are all games in both non boot, or self boot format.
where is the best place to get dreamcast isos. how do you know if all the isos are there.
where is a good place to get patches
and how do you burn self bootable games