FW450 in Round Rock

[drob...@austincc.edu]

I have a FW450 with an APM2.6 controller board, Power Module, the kit for the 450 came with 30A Opto ESC's and of course they have no BEC's. Also using the Spektrum DX7s transmitter with the AR8000 RX.
So I purchased a Castle 10amp  BEC and now need to hook it up. Have seen too many variations of how to hook this up and do not want to flub this up.  I am using the PDB for powering the ESC's.
Please can anyone steer me in the correct direction.
I have not seen much on the APM forum or this one yet. I am still looking.

Here in texas ready to fly.
my battery is a 5000mah 4cell lipo