Intel pentium 4 help please !!!?

i am building another pc and i just found a pentium 4 model 519 3066mhz. i need to find a ultra atx motherboard(pentium 4 compatible) that's maximum ram is 4gb or more.it has to be ultra atx as i already got a case that is ultra atx compatible and im not sure if you can put another type of motherboard. and if you can tell me a affordable video card most proffered nvidia thanks