David Kirk wrote:
I am not sure that you need a portfolio to approach agencies. Why not contact a couple in your area and find out what they require before paying to build up your portfolio?
If the agency people tell you you need some photos, THEN get them done.
Otherwise, use this site to get shoots as practice for working "real" jobs ... and have fun. I you worry too much, at this stage, you'll burn yourself out fast.
The suggestion about it being a business, that's true too. Conduct yourself as though you are the owner/manager of a modeling agency where you are the only model. Your professionalism will take you much, MUCH farther than your looks alone ever will.