Need to market my mobile application

I want to market mobile applications to a target audience from Chennai only at the moment. If you show good results. I can take your help on other cities What do I expect to achieve? 1) Need to do digital marketing or direct marketing or x/y/z ways and bring in real customers to my app 2) More users and app installation of the app is expected to happen from chennai location. 3) Potential customers to generate lead based on marketing and audience selected. 4) 10k installation of the app expected minimum 5) Timeline to finish the targe 15 days Ask me for more details about the app concept