ps2 rom gmaes questions

one of my friend said i don't need to mod my ps2 to play games i burn on cd/dvd that i just have to burn them right is this true if so plz tell me what program to use and how to burn them thank you

You need to mod your system or use a "swap disc". You can't just copy the games and play them directly.A swap disc being a special disc that you load, then change out with a burned copy of a real game.

how much can i buy one and where internet or store?

There is also softmods that can be run from a memory card.