I'm the kind of person who doesn't feel comfortable unless everything is spelled out for me... This'll just be a few questions about fans in general. I've never built a PC before, but I've finally achieved my funds and done all the planning. I've done as much research as I can, but I just can't seem to find anything extremely descriptive about fans/heat sinks. These questions may or may not even make sense, but please do your best to answer.
1) I read that there are 3-pin and 4-pin fan connectors, but how do I tell what kind my fans will use? Whenever I check the specs on the fans, it only lists the size.