I spin! Years ago I took a week long class. I would suggest a class if you can find one at a local yarn store. Especially if they let you try many different types of wheels... so you can decide what you like.
Some points to consider:
* wool quality is important. I buy wool, wool/mohair and wool/silk roving. Some will be easier to spin than others. Fiber length, cleanliness, "crimp, stable length all affect your spinning. So try lots of different fiber.
*spinning fiber and felting fiber are (slightly) different.
* you can learn on a drop spindle, then upgrade to a wheel. I would spin as much as possible before buying the wheel.
* you can get equipment used... google "spinners and weavers housecleaning pages."
* If you want to do a very fine yarn, the very best wheel is probably the Schact. ($800+++) But it will last 30 years or more, and do almost anything. Some less expensive wheels are the Baynes, Lendrum, and Ashord Traveller. I would get one of the first 2, not the Ashford... its just very ordinary.
* you will want to get a catalog from Halcyon Yarn in Maine. To drool on the pictures!
Best regards, sleeplessMommy