Buy a vocal mic (SM58) and record lots of noises.
Chop them up, eq them and put a load of effects on - hey presto - original sounds.

Learn synthesis and make your own drum and synth sounds - drumazon, reaktor if you're feeling brave....

If you want to make your own stuff be prepared to spend a lot of time learning how to make your own stuff. Much more rewarding, but takes time to get to grips with synth design and audio recording.