How do I Finalize / Submit / Release A finished UE4 Project?

So I have an old project in 4.19 that I recently completed and would like to submit for release.

I’m looking for a step by step process on how to take a completed project and get it “Cooked Down” to a phone / tablet, and perhaps even how to submit, it for google playstore, IOS, Steam etc.

I’m surprised there is very little content regarding these matters, as well as monetetizing and updating released projects. Any help would be greatly appreciated - thank you!