youtube is your friend. Also, look for as many photos on here as possible. They're fairly easy.
Water flows into sump, pump pumps it out. In between you have bio media. It can be as complicated or simple as you want it.
I would suggest using filter socks first in the equation, that'll get rid of most of the crud. Throw in a few sponges or other media afterwards, and have your bioballs/scrubbies/etc last. That way they're not collecting all the crud. Then if you want to to get high tech, throw some plants in. save the last section for your pump.