I need help!!!

I was looking for something new to do online since my recent encounter with meltyblood horrible online play and i notice that you can play games like MVC and FF:MTW online i d/l’d mame 64 since that is the recommended one but i don’t understand how to play my games online my files are cdi which it won’t let me load and…you know what someone just explain to me what to do and what to d/l to get this started aim me lingmaster7 and tell me something and if u own at xvsf then aim me also thanks in advance