For the financing, I would recommend a broker. Someone who does more than just traditional family purchase lending. Find a commercial broker, helpful if they are local to you but not necessary. For the first time, they are going to be in your corner to make sure you have the correct financials, documents and be able to share the "story" of your builds with lenders. Instead of going at it alone, I find it worth paying the point or 2 when the loan closes to make sure you are getting a good deal.
As for the second question, that all depends on your strategy and many other questions. How long are you going to hold them, are you going to live in one, are you going to refinance, etc...When you are ready to sell, then I would recommend worrying about the tax implications and talk with your CPA. without more detail, I would think a 1031 is your best route, or hold them and max the refinance and maybe pull cash out of them that way.