I am not to sure one would need a sheet for ESC's as most ESC have a number in there name, this number refers most of the time to the amount of amps it can handle. .
For example... a marine20 ESC would probably be able to handle 20 amps continues...
By looking at the maximum current drawn by the motor, you can then work out which ESC you will need..
Let's say you have two motors that draw 10 amps, you then have the choice of putting in two ESC's at a rating no less than 10, or one ESC with no less than a rating of 20.. better of higher..
This is all to be on the safe side, it's always better to get a higher rated ESC and not get it blown into black smoke, saves in the long run on the penny's getting spent on new ESC...
Or you could put a fuse in between the controller and the motor, in this event the fuse would blow instead of the ESC, but this would leave your boat in the middle of the pond without any power..