I'd mention some basics. Of course I don't know anything so take it with a grain of salt.
Usually an operator puts games in on a split, like 50-50. But with the rising cost of equipment it can be higher like 60-40 or 75-25 for the operator, or the operator may want a guarantee. X amount each week or the location makes up the difference.
An astute op will check the city where he wants to operate in, every city hall has a license division. And find out what he may all need. Might be a license on him, his company, each machine, and location. And find out if there are penalties for unlicensed games, some cities have heavy fines or confiscate equipment. And find out the zoning ordinances. You can't just put games everywhere, there could be some strange things you run into. Not every town wants games or arcades.
And he'd get his own insurance. someone gets hurt by a machine you own, and your name will be first on the hit list.
And if there is already an operator there, the location might already have a contract with that op and nobody else's equipment can be placed in there.
Do your homework, learn as much as you can. So you have the best chance at success.
Just in case you are a bit more than simply curious.
LTG