I would suggest reading Reranch 101 at http://www.reranch.com/ .
Then, I would read it again just to be on the safe side.
Next, make a list of all the supplies you will need (primer, paint, clear, various grits of sandpaper, sanding blocks, naptha, any sealers or fillers) and purchase them.
If you do choose to work with enamel (and it would not be my first choice due to longer than average cure times), strongly consider making a painting jig. You will minimize the potential for runs in the finish (one of the side effects of using enamel). In addition, it will be easier to get a consistent coat on the guitar.
Good Luck!
Kit Dean