You don't need a business plan, just need to work out how to make money. You need to engage bars/restaurants, and start servicing users (like 5-10 users will do

You don't need a business plan, just need to work out how to make money. You need to engage bars/restaurants, and start servicing users (like 5-10 users will do to start with). Know that this is a very crowded space, and ordering alcoholic drinks on an app is usually illegal due to age check not happening.