I am working on a Bulky project in Android alone. There is no Tech Lead or any Project manager to guide me about the project development. I have to interact with the client do the work according to his requirement and do the coding as well. Even i have to guide the one developer who is working on the back-end.

I want to make it work well with a proper planning and within time line. So please guide me what guidelines i have to follow to develop that project things to keep in mind and How to apply the Project management skills to that project ?