What I know;
That I should use DiscJuggler or Nero
That my DC can run backups
Where to get ISO's
That I should burn on a low speed
I already have Nero Burning ROM and Alcohol 120%
Some dumps of games are made for emulators and won't play on consoles

What I want to know;
How to fit these games on a 700MB CD
How to put split .rar files into one file
How much are things removed or reduced (sounds, FMV's, etc.) in games
How to put multiple games on a single disc
Anything with the word "boot" in it (Not too familiar with the concept of self-booting images or boot discs)
How to play imported backups (Ikaruga, Bangai-O, etc.)
Why some homebrew games won't work when practically every Dreamcast is the same
How to burn with all three programs (it's been a while since I last burned homebrew)
How to tell if a dump of a game won't play on a console