I mean an IC engine that runs on gasoline.
I'm doing that to save money on fuel since I heard it's a big jump to glow/nitro if you're going to be flying very often.

I'd be fine with starting with whatever is cheapest to get a test setup to learn. Then I could upgrade.
Any suggestions for that?

Is this accurate.....for any IC I need:
Engine
Ignition system
Battery for ignition (and other electronics)
fuel tank
Hand pump to fuel tank

.... anything else?