Iteration, learning, and a smart network are the key to successful entrepreneurship. IMHO, business plans get in the way if done too early. They have their place, but should not come when things are not yet clear and much learning remains.

Here is my 5 step generic business plan/algorithm for all beginning entrepreneurs…
1) Figure out what you really enjoy and have talent for… has it changed/adapted recently?
2) Develop what you enjoy, get good at it, go through many cycles of learning — quickly. Seek feedback, practice iteration!
3) Look[without blinders!] for opportunities to apply 2).
4) Adapt and build your network — strategically!
5) go to 1) and repeat.