Return pump / sump questions ?

[Acipenser]

I plan on putting some baffles in the sump.
1st about 2 inches below the rim of the tank the skimmer will go in here next I will have 3 baffles that are 4 inches high these will be 1 inch apart and then the final chamber will be about 1/2 of the tank I will have the return pump.
I just got back from J&L and picked up the Eheim Compact Pump 1000.