Prewashing is really up to the individual quilter. Some feel strongly one way, some the other. You will have to determine that yourself.

I am enjoying reading everyone's comments here and encourage you to continue asking questions as there is a wealth of knowledge here on the board. :thumbup:

If you are in a hurry to get started pick out a simple pattern and go for it. As others have said there is a wealth of information on the web. I'd still take a beginner class when I had a chance though.

You could also check to see if there is a quilt guild in your area. If you find a good guild you might be able to pick up pointers there.

The 4 best pieces of advice I ever heard: 1.Practice, 2.practice, 3.practice, and 4.there are no quilt police:
If you like it and it works, it works.