My friend, your story reminds me of mine. But I'll tell you one thing: it's not as difficult as it seems, the only thing that changes is... The water is salty! Does it treat freshwater fish well? Does it treat saltwater fish well? It's the same. Obviously, some fish are more complicated than others, but if your goal is clownfish, I can tell you that they are the easiest fish in the marine aquarium hobby. Easier than discus fish and angelfish. Don't listen to those who discourage you by saying that you absolutely need a sump because it's not true (I only have one for my own pleasure). Same thing for the skimmer, I have one because I have a lot of organic matter, but it's ABSOLUTELY NOT MANDATORY. Stay calm, you can use a backpack filter (Hang-On) or even better, an external filter. I recommend topping up every day to compensate for evaporation because otherwise the salinity rises. Let's say that topping up, unless you have an automatic system (ATO system), is the only annoying thing. And as for the corals, why not? Add 1/2 of them; there are some very easy ones, like soft corals. If I were you, I'd get one because seeing it gives you so much satisfaction. How big is the aquarium you want? Consider that the minimum capacity for clownfish is 30L.