im a bit lost with all this dsemu stuff,so just a couple of questions to help me.

just how good is ds emulation on the pc?geussing its much the same as n64,not entirely perfect and do you need a pc with a lot of horsepwer under the hood to run it?
and are most ds games playable or is it just a selct few?

Many games are playable although slowdowns will occur. Yes, you need a lot of horsepower to run games decently.