If you have somebody to help you make a simple algae turf scrubber, then go in that direction. If you feel like you are a handy person, then its a simple project to complete. If built properly, it will significantly help your water quality.
I'd urge you to get an in-sump skimmer since they are so much more effective than HOB
skimmer. Nevertheless, any skimmer will help, but I'm just saying you want the best bang for your buck. Then get a filter sock at the drain line.
After getting the three above, you shouldn't need anything else as a requirement. If you build it perfectly the first time, then your long-term success rate as a hobbyist is a lot better.