Good build your own PC howto

http://www17.tomshardware.com/howto/20020904/index.html

http://www17.tomshardware.com/howto/20020918/index.html

Just shop around and read review to find what you think you'd like to have and how much your willing to spend and find all the components you'd like to get and order them. Putting them together is actually the easiest part, figure out why they won't work is a lot harder.