Congratulations! I did the same thing last year. Check out some books, websites, other Deviant artists' work... Anything you can learn from. But mostly, just start painting. Experiment with colors, try a couple different mediums, different canvases, etc. Don't get discouraged if your first couple don't come out as well as you'd like. My first couple paintings pretty well sucked. Good luck and have fun with it!
Not specifically. There are a great many really good oil artists on DA, but there are a couple oil painting clubs you could check out. There's some general painting clubs as well. Oil, acrylic, watercolor... Good luck!
Don't use turpentine, the fumes are toxic and you can achieve the same thing with Gamsol, [link] a solvent made by the Gamblin company that is very low odor and not as harmful. Always paint with proper ventilation. Get a "silicoil brush cleaning tank", [link] one of the best tools I ever purchased for cleaning your brushes. (fill it with Gamsol) Wear latex gloves to keep the paint off your skin. If you have more questions, ask away.
I would just say be careful of your colors getting too muddy. A lot of people think that using black or grey to made shadows is good, but in reality it just makes the shadows muddy. Try deep purples and blues instead.
Yea sure you need some turpintine and some good paint thiner. Make sure you clean your brushes work in thin glazes then build up slowly. be prepared for long drying times. You are going to need brushes that can deal with oil paint. be carefull oil paint and solutions can be harmful dont inhale fumes or leave on skin to long. you may want to get a walter foster book they are great for people just starting out. if you need anymore info just ask.