What skills do you have? Based on your skills, find low hanging fruits and go for them. No need to think too much or do any validation etc. Take a shotgun approach. Launch bunch of small projects and see what sticks.
Can you do WordPress? Can you learn quickly? Join affiliate programs and launch bunch of sites in obscure topics you know and/or interested in. Outsource writing to Fiverr, Upwork etc freelance sites.
I have a full time job as a PM in a Fintech startup. It's not bad but I really want to have my own thing and be job independent. I can also program in Ruby on Rails and do a lot of automation scripts.
The issue is that I have too many ideas and that's more of a distraction than anything else. I think creating is not an issue but marketing what I want and to whom is the bigger issue.
If you like creating, just create. Don’t worry about marketing. Overtime, you will figure out.
If you start with certain Return expectations, and then don’t get close to those expectations you will be disappointed. Just don’t have any expectations. Just create. Do for the fun of creating.
For those that don’t know, go to the thetagang subreddit.
I haven’t done anything yet. Still studying.