I want to echo @FrankenCreations ’ sentiment and expound upon a few points.
You need to test the game on the actual platform you’re releasing it. How would you feel about buying a game, only to discover it doesn’t work and was never tested on an actual device?
Contrary to what sales line you may have bought into, making games actually requires a bit of an investment on your part.
So, here’s the thing. You’re probably not going to make money. Not at first. If you’re lucky, you’ll put in years of effort and crank out a decent product or two, and you’ll make enough money to recoup some of your costs, but not nearly enough to make the hours you put into it more profitable than working a part-time job at McDonald’s.
You’re looking at the game market and seeing these stand-out hits that make millions and thinking you’ll just emulate them. But that’s not how it works. Read the article @Kiwasi linked.
If you’re making games to try to make money, you’re not in it for the right reason. Maybe you’ll be that one-in-a-million that somehow manages to make money off a basic game, but why plan for that unlikely occurrence when there are much surer ways to make money out there (like getting another job or doing contract work). I’ll say it again because it’s worth saying: games are not an effective get rich quick scheme.
This suggests a fundamental lack of knowledge you’ll need to have if you want to be even a competent developer, much less a successful one. Spend some time educating yourself on the mobile industry, if that’s what you want to get into.
This, to me, is the most standout statement of your entire post. You recognize that you could have learned all of this from Googling, but chose to ask here instead. You’re not alone in that, sure, but it suggests a lack of agency in your desire to be a developer.
As far as patience goes… if you don’t have that, I have no idea how you can produce anything worth people’s time or money. I’m not sure what else I can say on that.
I don’t know that there’s any way to measure that, because it really depends on what those 10 apps are. It’s definitely somewhere between $0 and $1,000,000,000,000 though.