Stupid questions about fans

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. :D

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.

2) Back to the connectors, but how do I know whether or not my mobo will have enough connectors for my fans? My case has 4 different fans (, and I'm also planning on throwing a CPU cooler in for overclocking.

3) I also read somewhere that case fans should plug into the PSU, but I don't really see anything on PSUs that looks like they do anything other than supply power to the mobo.

Again, I'm sure these are dumb questions. Any help would be extremely appreciated, though. If you want to see the parts I've selected, I've provided a link below.
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  1. Best answer
    1. You can sometimes find the info on the manufacturer's web site. Four-pin connectors can be plugged into three-pin headers, so you're covered either way.

    2. Find a review of your mainboard that includes close-up pictures and count the fan headers.

    3. Most fans come with Molex adapters that can be plugged into the power supply.
  2. Best answer selected by Alxariam.
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