How can I achieve to sound like the recording on the parts of the songs listed below:

-Original Prankster: main riff backing synth
-Hit That: every keyboard parts
-You're gonna go far, kid: pre-chorus riff
-Hammerhead: intro
-She's got issues: trademark riff
-come out and play: egiptian riff

I can play guitar and I'm pretty good at it (at least fot The Off), but I don't know shit about guitar effects, and I don't possess any, just a footswitch for my crappy 30 W. Laney... so, if someone could tell me how do I achieve to get those sounds, I would really appreciate, I need it for my Offspring tribute, thanks!