Help

Can anyone help me start to build my own computer. I want to be able to play games on my computer also have the ability to stream. I wouldnt mine being able to stream from console either. I have a happauge but my computer i have right now lags everything up when I stream from it. I do not know much about computers so any help would be great! Thank you!

What's your budget? 

Need a little more info... Budget, What games you're playing, how much power you want etc.