I think in-depth market research is a perfect place to start.
Many businesses fail due to inadequate market research (in terms of market need/willingness to pay, demand and already active competitors). https://www.cbinsights.com/research/startup-failure-reasons-top/. Market research will help clarify your thinking and firm up some of your ideas (even if your ideas are very vague at this stage).
I find these tools very helpful. https://moz.com. There are tutorials to get you started, and a free 30-day trial will be more than enough for you to get some insights.
First, think about the sorts of problems you might want to solve. Then, consider how people might type those problems into Google to try and find help or a solution. In other words, come up with lots of “keyword” ideas (keywords are the phrases that people might type into a search engine).
Next, enter your search phrase ideas into the Keyword Explorer tool in Moz. This will help you assess “search volumes” for your phrase ideas (indicating whether there is a demand in the market). Take a good look at what results are ranking on Google for your phrase ideas. This will give you an indication as to what type of solutions that are out there and what you would need to compete with or position against. ( https://www.disruptiveadvertising.com/marketing/positioning-in-marketing/).
NB)You can pick the region you want search results from, I recommend the US to start with.
Moz also offers a Keyword Suggestion tool to give you ideas on some other search terms that may be related to your idea.
This may sound complicated but I promise you it isn’t once you get started.
Be warned, it’s easy to get sucked into the research and spend hours on it at a time (which in your case wouldn’t be a bad thing because it will help to stimulate your ideas and refine your thinking). I recommend opening up lots of browser windows as you go and using the https://www.one-tab.com/ to save everything when you need a break or to put stuff aside for later. I later sort my One Tab content into “Competitors”, “Competing Content”, “Possible Partners”, etc. (You can drag and drop and add titles to One Tab saves).
Much of the start-up advice out that is to “just get started” and “commit” and “go hard”. However, most start-ups fail. In-depth market research at the beginning gives you the best possible chance of success.
Don’t worry if you find competitors in the space. Competitors aren’t a bad thing because they indicate there is a market for your idea. You just need to find a way to do it better and “position” yourself against them.
Also, remember there is no shame in deciding that your idea doesn’t have merit (once you have done all the research) and you need to go back to the drawing board. It’s much better to come to this (informed) conclusion before you start then when you invested your heart soul (and bank account!) into an idea that has been poorly researched.
I have personally researched many different ideas and ended up back at the drawing board. Still, these ideas have a way of coming back to you in a different form and you have to learn to embrace the process of idea and business creation (which is often two steps forward three steps back five steps sideways and finally a step ahead).
Be well, good luck, and reach out if you need any more help.