When do you typically travel, and where would you want to stay? Generally the larger villas (AKV, SSR, and OKW) have availability at less than 7 months out for stays of a week or more. The others should be booked as close to 11 months out as possible for best availability.
We recently bought at BLT and were able to get a 2 BR lake view at about 8 months out for mid-November travel dates. Standard views were not available by then for 2BRs. There were standard views in 1BR and studios available for sporadic days I think. It took us about 3 months from start-to-finish from making an offer to having the points available to us, although it could take as little as 8-10 weeks if you are lucky and every step of the way goes smoothly. For us, the resale process was very SLOWWwwwww and each step took as long as it possibly could have (e.g. ROFR is pretty much guaranteed to be 30 days or less, for us it was exactly 30 days, estoppel took forever, getting Disney to issue the member numer took a while and I could not get member services to release it to me sooner, etc). It was a pain, but it saved us thousands over resale and was worth it in the long-run. Just realize that you probably need to buy at least 14 months in advance of when you plan to book your first stay (11 months + 3 months out).