Welcome, you have come to the right place for help with your car; there are some really sharp minds here. You will want to provide which engine your car has 4 or 6 cylinder
Let’s start with the simple things for your car.
I bought a 1991 Toyota Camry (manual transmission) 4 years ago from my brother-in-law. I drove it a few times back then, but for a few years it was just parked in our driveway. In June I decided to use it again (fixed minor problems) and the car drove well.
After fixing the minor problems can I assume that you got in the car, started it up and drove it away? Or did you have to do maintenance on the car get it running, if so what?
If you did not do this at that time, you will want to change out your oil & filter, your air filter, and your spark plugs.
As for the gas smell it does not take much gas seepage to create an odor, while you can smell gas it may not be enough to puddle below on the ground. You will need to start by inspecting your gas lines/ hoses. On the 4 cly model inside the engine compartment there is a (black) filter canister on the driver’s side, below the master brake cylinder, these metal lines come from the tank. Begin here and trace out each line to make sure all clamps are tight and there is no sign of seepage, if there is, make needed repairs.
You may also want to use a can of sea foam in your engine; the folks at the auto parts store can instruct you on best to use it.
http://www.seafoamsales.com/motor-treatment.html
If it continues to run ruff you may want to search for vacuum leaks, use the search function on the forum for more information about this problem.
Good luck, and please do let us know what you find