DO THEM ALL!!!
Maybe Starting businesses is really your business. Not running them.

Create a generic business name, corporation, and domain name, phone number, email, etc that can be used as a central location for every other business you may create. Call it ZAZA or whatever you want. Just make it non specific.

Start with your easiest idea. (One that you can do by yourself, requires the least capital, requires the least time, requires the least effort from you.) Remember "least" doesn't Mean "Little".

Bring it to a point of completion or to a point where you make a buck, It doesn't matter how much but making a dollars shows you have viable product people are willing to pay for.

Set your business in automatic mode by hiring partners, or outsourcing marketing ect so you can do this process all over again with your other business.

Maybe Starting businesses is really your business. Not running them. Your problem is very common among people who are multi talented.