Grimlock66

I'm kinda new to the emulation game, I've been fortunate enough to be able to run on mostly original equipment. The last time I dealt with ROMs was with MAME on my pc. Are there any preferred sites out there to get ROMs from and, more importantly, any to avoid? Thanks in advance. (Thanks for the advice Unixdude)

Hi, I just loaded up my Retro 77 with the image. When I start it up, this is the screen I get. Is this normal?