first thing is to pick a CPU and matching motherboard socket. Like an intel i5 core socket
1150 and motherboard with an
1150 socket.
Here is an
example only of a matching set:
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.1515377then look at the specs on the motherboard and see what the memory specifications are and find that type.
now for video cards, that would be a matter of use, meaning a gaming rig would be better with a stand alone card(PCIex16 slot on the motherboard), but just a computer for household that is not graphics demanding might not require a video card. I think most of the i5 or i7 series CPU's have limited graphics on the chip.
many additional options are out there like HDD or SSD (hard drive or solid state drive), sound card, operating system ETC.
newegg has a basic computer building tutorial on their website that is helpful located on this page:
http://www.newegg.com/Computer-Hardware/StoreI am by no means an expert and many of our other readers can help better than myself. I just build my systems for the fun of it.
68valu