MAME Help

not sure if this is in the right location ( apologies if its not) I have downloaded the MAME system so that could play some classic arcade gamesand try to re-live my youth ! could someone assist me in what ISO's or ROMs will work with it, or suggest a site where i can find some ?thanks.

Uh here's a good place to look ;) Check what filetypes MAME can open, then pick your pick.