Built me B2C application for North India

I am in building materials supply business and looking to develop a application to help me in expanding my business. I am from north India and want someone who can help me and let me go through different stages of how the app will be develop, How much it will cost me, what kind of licenses it will require, help me find a good app developer and many other things. After our initial discussion I want to hire him in through out the process of app development.