You can start with the Basic 7 tool set. Master all of them and go from there, one tool at a time you can upgrade to a Barry King or Clay Miller. You can always get the tool numbers off of the basic 7 set and do your own search on ebay for them individually. Depends on much work you put into it, you may come out better then expected.
I would suggest you pick a project, start small and go from there. Learn as much as you can about leather, tools, processes , finishing and so forth before you take on any big project. This forum helped me so much at the beginning and I try to share in return. I cannot tell you how much guidance is stored on this site, but like anything you will have to put the time to look, read and find it. If done right, you will spend hours on this site before picking up a piece of leather.
As always, remember to share you photos, your questions and by all means a small contributions to the site administrators to help them offset the costs to run this site.
Good luck!
Sam