That sounds like an interesting tournament, most tournaments consider one boat fishing two persons as a "Team" and if i am not wrong it is a total weight of what the team catches. $15.00 sounds reasonable enough for an entry fee. I am not so sure i would include the bank fishing as part of your tournament.
If you have access to other tournament rules(crappie, bass,or walleye) you may be able to incorporate those into your bream tournament rules such as number,size, weight and so on.Starting time and finish time etc etc
To Whom Much Is Given, Much Is Required