Ask HN: I have a FANSI. What should I do?

I have a solution to a worldwide problem qualifying for the "Frighteningly Ambitious [new] Startup Idea" (FANSI) criteria with an initial sound business model.

Unfortunately I'm close to 50, with my roots deep in Europe (Marseille in France). I have no experiences and no trustful mentor to help me start a business.

For now I'm learning mobile web app development to get a quick running service and I'm trying to patent the solution to secure my bootstrapping. But I feel it all as frustratingly inefficient.

What could I do to get into higher gears ?