As we know - the idea itself is worth 0 Exactly. Go out and work out your marketing plan first: who are the users you want to target, and how are you going to

As we know - the idea itself is worth 0 Exactly. Go out and work out your marketing plan first: who are the users you want to target, and how are you going to get them to sign up for you app? If you can execute this step successfully, creating the app itself will be the easiest part :)