I would like to find financing to buy some land now, and then build on it later.
Financing a land-only purchase can be difficult but it's not impossible. Depending on where you are, you may need to get a secured personal loan instead of a mortgage. If you're purchasing more than a few acres you may be able to get Farmer's Home loan (it's like an FHA mortgage), so ask about it. Only a few mortgage companies offer this type of product, so your best bet will probably be a local bank or savings & loan.