Don't know where you can find a map of VWL. There is a map of WL on this site (go to home page, then resort maps, then Wilderness Lodge) which does not yet show VWL but if you look there it is in the large wooded area shown on the right part of that map.
Buying through Disney is easy. Closing costs are paid by Disney, financing is easy, and the process is very easy. Nevertheless, buying through resale is not an overly burdensome process and places like the Timeshare Store make it pretty simple. You do need a little savvy in negotiating and go through the effort of determining true cost. In a resale price is negotiable and buyer pays closing costs although that is also negotiable. Where complications arise is in financing. If you can get a home equity loan on existing home you can get a rate less than Disney's. If not you need to find financing and the rates are usually higher than Disney--that is very important in determining true cost as a significant rate difference for the loan can mean a resale at $60 a point will actually end up costing more than a purchase at $72 a point through Disney. But that is a matter of doing some math. The somewhat extra effort in pursuing a resale can often mean saving $2,000 or more.
More important probably than the cost and effort factors is desired resort. At your home resort you can reserve 11 months out, at another only 7. That is an important difference as it is often difficult to get into places like BWV with only the 7 month window at many times of the year. Thus, a large consideration is where you wany to stay most. OKW has the largest rooms, a quiet atmosphere (located around a golf course), lowest point costs per night, and currently lowest annual dues. BWV has the best location of any of the resorts (walk to both Epcot and MGM), a hotel type atmosphere, lots of activities, and the best pool of the group. The WL and VWL area is perhaps the prettiest on site and best theming but the point costs are the same as BWV which is more ideally located. OKW and BWV are available only through resale. VWL has no resale market yet and is available only through Disney. In other words, where you want to buy is probably the most important factor in determining whether to go with Disney or resale.