Chariclo, buying a REGION means u must be a millionare lol
Welcome to forums, but set your sites in learning the "Good the bad and the ugly", theres good knowledge bases in SL official website that tells u the pitfalls, of renting or buying land.
Im glad u rented a place, this is by far the best way to get learning about the workings of SL,
because, as u say , u can learn about prims, also u should put in a search for low prim stuff, such as furniture and hot tubs, my first and my second better glass house type of rental apartment I rented was from Cristalle, I found, and still have 10 low prim places i still use.
I furnished one of crystals glass buildings with a "muse hot tub" amazing tub with menus, steam, and poses, although it was fairly expensive, the prims were very low, and after I bought a few couches and bit and bobs, I still had a few in reserve!
The other good thing about having your own pad for a while is that, whatever u buy, u can unpack and try/wear etc...learn how to make a few things, put up a board and play with textures, uplaod a phot or two, make your own pics.....as u say, so many options, but as folk are saying, this isnt the Sims, its about real life risk taking with your real money, so just look around, make some friends and contacts. etc...
Just be very careful buying land.....even my associate who is skilled in estate mangement, had a her land sold under her feet, buy a supposingly trusted land owner....try and get recommendations from other people, perhaps visit a sim u may want to start your own little house on, and visit other residents, and politley ask them, if the land owner is 100% reliable, and so on....
Rhaorth Antonelli is a trusted and a good mentor for anybody in need of some help

She certainly sorted out a problem with my group some weeks ago, and is a very nice person

)
Anyway best of luck m8 take care
mike