Regular gasoline will be fine. You should use whichever oil is recommended for your climate in the engines owners manual. I use Mobile1 10w 30, and regular fuel.
Engine storage is pretty simple, here's a few things that can be done:
-fuel stabilizer.
-shutting off fuel valve & draining carburetor.
-draining fuel tank, carb, and fuel lines.
-I'm not very familiar with the process, but I have heard of people "fogging" the engine, you'll have to research that if your interested.
As i mentioned before, be sure to look into the cost of clutches BEFORE spending any money on a new engine.