Thank you very much
All of your questions are answered in the Unreal licensing text, which you should read an interpret yourself (ideally, with the help of your own lawyer, which clearly everybody has, right? 
)
That being said, here’s how I would interpret the Unreal license for my use.
- No Unreal logo needed.
- If I win money, it’s mine. Except the part the tax people want. I would set aside and pay in that part, because I don’t like going to prison for tax evasion.
- If I win MORE THAN A MILLION BUCKS then Epic starts getting paid. Most prizes are significantly less than that.
- Yes, I can edit videos in other programs, and publish those as videos. I don’t even need to pay for using the engine at that point, because I don’t ship the engine to anyone else.
- Yes, I can make streams of my development for anyone else to see.
- I would use the "package project for " option to export a game, and then I would use WiX to build an installer for Windows (or another native packager for other platforms.)
- I have not done any “paper” paperwork – everything’s covered by the click-through license I was presented with when initially signing up for the engine.
Also, very important:
- All the artwork I use, I have to have rights to – either, I purchase it in the asset store, or I have some other license that makes it clear I have rights of redistribution in derived form.
It’s unlikely Epic staff would answer more than “read the license,” because the Epic staff are not lawyers, and they don’t work for you, even if they were, so they can’t give you advice that applies to whatever you want to do.
The absolutely 100% hardest part here is making a game that’s worth anyone’s time for playing – making it fun, and not buggy!
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