You might start with these books, the Universal Saxophone Method by Paul De Ville, and The Art of Saxophone Playing by Larry Teal. However I strongly suggest you find a teacher, and not try to teach yourself how to play.

Your Uncle doesn't have to break the bank to get you a good horn to learn on.  Used Yamaha 23s are ubiquitous and can go for about $500 in good condition.  You can get a used Bundy I for even less.  But remember, with used horns condition is everything and some costs for play conditioning shoule be anticipated.  Antigua and Jupiter are currently producing good Taiwanese student models that go for about a grand if he's not into the complexities of the used market. They're pretty common in music stores.   Kessler has some student horns in that range too at their online store.

If you're looking for pointers and tips for everything from basic tone  production to practice routines to jazz improvisation, here's a link to a good site.

 http://www.bestsaxophonewebsiteever.com/

In the beginning the most important thing to have is any sax in good working order. (you should rent) Next would be a good teacher. Trying to learn on your own is too slow a process. A teacher will save you loads of time. Get the sax, then get the teacher, then work hard, then decide if saxophone is important enough to "make Jazz the focus" of your life. Cheers!