Aaron knows I have a lot of respect for him and his opinions, but I have to disagree that a GTP is more difficult than a BP. In fact, when it comes to feeding, they are much easier! So often people over think GTP husbandry. They do need a touch higher humidity, but honestly, keeping one is no harder than keeping any of my boas.
But I totally agree that you should pick up that book - it's a GTP owner's bible!!
I think they do benefit from a slightly more elaborate set-up. I know many folks keep them in tubs, but they do have perches and usually vines of some sort in there too. A T12 is fine. I recommend a 2x2x2 or better yet a 3x2x2. PVC enclosures are best. Animal plastics makes good ones and so does Jim at www.pvccages.com. Use perches that are smaller than the girth of the snake and I like to provide at least 2 thicknesses so my snake has a choice. Live plants will also add to the asthetics and imporve air quality.
I highly recommend getting an older juvenile or young adult - not a neonate. Neos are very fragile and, for your first, you'd be best off with something a little older and better established. PM me and I'd be happy to recommend a few breeders. With GTPs more so than other snakes, it's vitally important to get one from a good breeder and not an unknown source.
Treat your GTP like you would any other snake and you'll be fine!!