How do you research your startup idea?

I've find that with all of my business ventures I never know where to find the information I need. Ideally I could just pay someone to figure out all the steps I need to take to action a venture. Right now I find obscure bits of information on the internet or get lucky and meet someone who knows about the domain and piece together the information imperfectly.

Right now I'm looking to figure out how I go about creating a neobank in a specific country and there just doesn't seem to be any useful information anywhere. I've found with obscure or difficult tasks, no one has done the research.