Since I don't see any salt creep, I'm going to guess this is F/W (besides there is a S/W DIY section on here otherwise).
Is there a pre-filter (filter floss, poly-fil) and a drip plate?
You could fill the chamber with the pump and beside the pump with the orange bio-balls, then in the fist chamber put a mix of scrubbies and ceramic media with the rest of the orange bio-balls.
Now if we just knew if you have a big enough bio-load to support it all.
yeah put the organge stuff in bags so it can be easly removed then put it in the pump section then mix medias in teh main chamber as dr joe says and you should be set . a little more tank info and we will know for sure.
yes its a saltwater wet dry it has a drip plate and everything i think its a 20 gallon or 15 gallon wet dry so if you could tell me like how i should organize the filter to have better filter media its for a 75 gallon saltwater tank