Welcome to the insanity...
1. The HobbyZone Super Cub is a ready to fly electric model that fits the budget. It is highly recommended by many on RCU as a good way to start on a budget. It is available at hobby shops or online from
http://www.horizonhobby.com/Products...ProdID=HBZ7100
2. Simulators help figure out what the controls do, and they help, but they do not truly teach you to fly.
3. It varies from one model to the next. Some are more complete than others.
4. Gasoline engines are heavy, expensive, and typically are not recommended for beginners. Engines that run on glow fuel (some like to call it nitro), and Electric motors, are typically what you will see on beginner and intermediate models. One is not 'better' than the other, they are just different and everyone has a preference.
What area are you in? Put your zip code in at
http://www.modelaircraft.org/clubsearch.aspx and see if there are any RC clubs in your area. Practically all clubs have instructors who will teach you to fly and there is no charge except the cost of club membership. You do not have to have an instructor or join a club. It does make it easier though if you have help, and you'll make friends with people who love model airplanes.