Check them out. Local club and I’m sure they’d be willing to help you out with info. Keep an open mind and don’t believe everything you hear, otherwise you’ll be buying a bunch of stuff you don’t need. They used to have monthly meeting at peoples house so it’s a good way to check out other people’s system. It’s a hobby you and your son will have to do together, IMHO he is to young to do it by himself.
I had a few tanks the past 15 yrs with my last being a custom 8’ long full reef. Your tank is small and you need to keep it very simple. Only 2-3 fish... hardy ones.( clowns, damsel). Soft corals if you want reef. Again ones that are easy to keep, which are still tough unless parameters are perfect. You have a very small tank. Good protein skimmer, research it and get a good one, the best you can afford. You have a small tank..did I say that before? If you can and have a cabinet it sits on put the biggest sump you can under it. The more volume of water the better.
It’s a cool hobby. I used to say the hardest part is resisting the urge to buy the pretty stuff you see at the pet store that your tank is not capable of keeping alive.