How to make Android app and add it in Playstore

There are two options for this: either you develop the app on your own or get it developed by an agency or company. If you go for the first option, you will have to first learn the basics of app development and it will consume a lot of time. Thus if you have got some money to invest, it is better to hire a company to develop the app for you. One precaution to take here is that get everything in contract as sometimes some companies also steal the ideas and use it for their own app.