FUCKING GOOGLE IT!
But since Im here,
make it a 64 bit by installing 32 bit windows again.
buy a nice 1050ti off amazon and then find the internal pcie connector to hook it up.
for ram, just find another stick of whatever ddr ram you need. Probably ddr3. Pc ram works well and is twice as long because it had hyperthreading, meaning itll be faster under load (gaming).