Income tax filing for self managed business

I am planning to start a business by attaching cars with Uber. While discussing with them they mentioned that for the financial transaction I simply need to give them my Savings Account number. My question is during the Income Tax filing how do I show the expenses incurred such as Driver Salary, Car Maintenance cost, Fuel cost, etc. I guess by showing these expenses will help me get tax benefits. Do I need to submit the bills against these transactions to the authorities? Do I need to register a Sole Proprietary Firm for that purpose? Will it be needed?