What are the first few things I should do if I have a great business idea?
It’s a GPS based app for a service where I will want users to see local vendors providing the services near their location. Users will also see the reviews etc
There are so many things exactly like this already.
Buy a domain!
It's called Yelp.
Find an app developer.
And tell them "I'll handle the business side."
that already exists! even if you can do it better, you have no moat. this is not a business worth pursuing
Pursue if you believe in it. Get a team first. Alone with full time job would be tough.
Prototype, show it to friends, then show it to other people. Reiterate until you can impress. Go to an investor.
Validate the problem you're solving, then validate the solution you have to that problem. Talk to people first...it's cheaper than investing in an idea that fails
Like craigslist and Angie’s list ?