Development of a store on Android

There is an idea to make an online store for Android in the form of an application. The entire catalog of the online store should be pumped into the user's device and be accessible even when offline. Also in offline mode, it should be possible to collect a basket and send an order to the online store number, which will automatically create an order on the server of the online store. It should also be possible to leave comments, add to bookmarks, etc. I need a specialist in my field, so I ask people without portfolios not to disturb.