You next step should be to create first version of you application.
You don't have a business plan, all you have is a document with the title "business plan".
An actual business plan would include, well, a plan for how to start your business - including actual steps you have to follow.
Here are the steps I follow when I think about introducing a new product (I don't really know what you are trying to do, so this may of may not be relevant for you):
I personally think that self-funded is the way to go unless there isn't any other choice and because I have no expiration what so ever with outside funding I can't really say anything about it.
Ditto what Ross said. You need to actually build the app -- even a primitive, ugly version of it. Seeking funding with no prototype and no revenue will be next to impossible and suck up all your resources for the next year. Build a prototype and sign up some customers, and you may discover you don't need the funding at all.