Custom Bmx For Sal How Do I Build A Custom Bmx Bike? How Do I Know What Size Parts I Need And How They Will Fit If I Order Online?

How do i build a custom bmx bike? how do i know what size parts i need and how they will fit if i order online? - custom bmx for sal

I get a new bike compound (danscomp) I do not know what parts I need? What a top tube, neglect, and BB?