hi. i’d usually say start with identifying what you’re good at OR what you’re passionate about. but in many cases, what we are passionate about cannot be really translated to revenues lol.
so i guess another point you can address aside from your skills is this decision:
do i target an unfulfilled need OR do i ride a fast growing demand?
targeting an unfulfilled need doesn’t necessitate a BREAKTHROUGH (although it would be nice). it can be something soooo simple you’d be surprised you didn’t think of it sooner. walk around town and look at what people do, ask about their day, what bothers them, what are the bottlenecks in their day to day activity. talk to moms, students, etc. it’s just there waiting to be discovered. :)
riding fast growing demand tends to be temporary because a market demand will eventually be saturated. that is unless you are able to build your brand or innovate and product differentiate. in my opinion, this is easier to do. just think of something that a lot of people are into and do something to provide that service, hopefully in a more unique way. like when the power mac laptops are starting to fill the laptop market. with their expensive accessories, people clamor for cheap but pretty laptop bags. a bunch of college students started producing really chic laptop sleeves and sold them online - it was a hit (at least here in our country). and then a month later 10 more groups started selling them too, each original with their own designs.
after you’ve identified the business you want, come up with a BUSINESS PLAN. i’m sure you know this already and there are a lot of templates online. it shouldn’t be something too academic, just for you to put things into writing and have a reference later on. and eventually, when you decide to ask financing or support, it’s something you can readily show to other parties.
best of luck! :)