Samples, you just gotta time scretch and chop til it fits... when you takin them from two diff sources that is NOT gonna be easy. Maybe you sohuld start by flippin one at a time, then work up to Pete status lol.

Synths, basslines and other stuff... you just gotta search dude. Usually most any synth will work, you just gotta get busy with tweaking so it don't sound too outta place with the sample. Usually everything you need is in the sample tho, except drums and a bassline... which usually you can EQ that to your liking and avoid having to add one.