Well.. there are several ways to start. The best way might depend on your existing knowledge of the instrument and/or previous woodworking experience.
Not sure where you are located, but there are courses offered that can really give you a solid start in lutherie. Kits are a great way to get familiar with the principles of guitar making, but with most kits you will need much more information than is provided with kit's instructions. Some good books, DVD's and the help of the generous people here can help you get through that first build.
Personally I started by reading books, from the internet and basically any source of info I could find. Then about a year later I ordered a kit from LMI. After that I did a scratch build. Both guitars turned out really well but having done a lot of research ahead of time really helped. I've recently taken a course to furthur my knowledge, learn new/different ways of doing things and in the process built two more. I think most people here will agree lutherie is a journey of continuous learning.
No matter which method you choose you will recieve nothing but encouragement here, so go for it!
my 2 cents,
Chad
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