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I would highly recommend learning to throw a Buzz (X orESP). The basics you will learn off this one disc alone will help you understand the flight characteristics of any other disc you put in your hand. Don't be so big about the distance, that will come once you understand what your body, arm, and wrist needs to be doing. You should be able to throw the Buzz flat and straight, then simple hyzers, high hyzers, flat spanking anhyzers, and big high anhyzers. Then start looking for a driver. I think the X or Z Avenger will continue to train your throw, so you can graduate to more overstable drivers.
how about an XL???
I'd have to agree with Ryan about a Cyclone and Gazelle. A Gazelle happens to be my favorite disc and is very controllable; this is what you want as disc golf in the end is a game of accuracy. If a Gazelle or Cyclone are too much for you in the beginning, then go with a stable mid like a Buzzz, Buzzz SS, or a Aurora MS. You'd be surprised how far you can throw a mid once your form starts shaping up.
If you're truly a beginner, don't go throwing Firebirds, Wraiths, Destroyers, Orcs, or whatever is above a speed 8 disc (especially in premium plastic) or you'll regret it and you'll develop bad form. Also, a Leopard is definitely an honorable mention.