I'd say since you are just learning, you only need a basic sump with a return pump, skimmer, and heater. Once this is all set up, then you can add reactors if needed.
Get rid of the bioballs and attach a filter sock to the drain. This will filter out large detritus. I personally find these fancy sumps with the baffles to be overly complicated and unnecessary. My sump is a 20 gallon long tank, no baffles, and with no particular layout. I maintain a very healthy and stable system.