Hey AquaBotNewb, welcome to ThePlantedTank.
I'd say a 24watt compact 6500K bulb for a 5.5 gallon is really good enough to grow HC on Amazonia Aquasoil. If you want to be successful with HC in that tank, you have to make sure you monitor your co2 levels to be at a good range for plants, dose your fertilizers daily, adjust lighting time, have good water flow and your good to go. As for BPS, I think 1 BPS or 1 bubble per half second would do.
By the way, get yourself a co2 drop checker with good quality solution and use it to check your co2 levels. It'll make checking rising/dropping co2 levels easier than test kits, unless you have the money for them, they are definitely more accurate.
As for other plants besides HC, you could go with the small eriocaulon species, tonina species, if you are up for the challenge.. they require soft water and a lot more demanding in care, so if you screw up, they will slowly die on ya.. Trust me, I messed up on erios and toninas a lot in the past. If you don't have parameters going in the right direction in the tank, it's game over within a few weeks. Eh, those are advanced plants.. honestly I recommend you get the easier, beginner plants firsthand before you plunge for those kind of plants.. but up to you to decide if you want to go straight in for the difficult plants. Anyway try Rotala rountifolia on the back, it'll look great. The good thing about rotala species is that the stems don't get far too thick nor leaves too large or anything than will shade the tank excessively that can kill the HC because of shading. So try rotala rountifolia. And then there's also some easy to grow ludwigua species, bacopa species, both are worth getting as cool backdrop. It depends on what you like.
20 gallon - Red Cherry Shrimp/Marbled crayfish tank
55 gallon - Dutch scape low-tech planted tank
250 gallon - Red hook silver dollar/Silver dollars/PB Jack Dempsey/Clown loaches/Tinfoil barb/Roseline sharks/Bala shark Monster fish tank