That is not a question answered easily.... Google is your friend.
I do not think there are "kits" that handle processor, mobo & graphics cards... that will be a custom build.
Here are a few links to get you started:
http://lifehacker.com/5940236/a-beginner…g-your-computer
http://www.pcworld.com/article/2028293/l…ed-to-know.html
http://www.tomshardware.com/t/cooling/
http://linustechtips.com/main/forum/36-water-cooling/
http://www.overclock.net/newsearch?search=water+cooling
You have a lot of decisions to make and this forum will be more useful when you get to moire specific questions.
Good luck