Player 1 and Player 2 will arrange a match and stipulate the rules as well as each players contribution. The winner takes all less 7.5% Commision.
Considering that you're probably not going to deal with a large player base, you might want to add incentives for losers to come back and play again
[e.g. it can be some kind of reward based on the number of games, but it might require having a dedicated platform to track stuff easily].
Edit: To all the people talking about me being a newbie and shouldn't be trusted:
No disrespect to the forum but there is a life out there and your status on this forum is not a measurement of anyones Integrity.
Both sides have valid points... An alternative route would be a multisig setup, but it complicates the whole process.