Don't know a whole lot about freshwater. I jumped right into marine tanks in May. Bought Hyla's tank when he went off to school. It really isn't hard to take care of if you get a big tank (55g+, 70 or higher is best). Actually, a lot of folks who keep both say that over 100g, SW is way easier than FW. I dunno though.
My one big advice, and I would imagine it applies to FW too? Is to use a quarentine tank (QT). In SW, some of the treatments for various diseases that work real well will kill off coral and other inverts. So when you purchase a new fish, you put it in the QT for 2-4 weeks, make sure it is healthy and happy before moving it in to the main tank. Most of your diseases come from new fish (the stress of the move being the big factor, plus you never know now long the fish store had them). And should a fish in the main tank get sick, you can move them to QT to treat, and keep it from spreading perhaps.
Oh, BE PATIENT. "Nothing good ever happened quickly in a tank". Add fish slowly. You have to give the bacteria in your tank that convert amonia to nitrite to nitrates time to adjust to the increased bioload for each fish. When you initialy cycle your tank, and all your readings look good, dont dump in every fish you want. Add 1 or 2 at a time with a week or two in between.
Mine is 120g, 6 foot long tank with a 25 gallon refugium.
I have:
1 Oscelaris clown (think Nemo).
1 neon (arabian) pseudochromis/dottyback
1 red lipped blenny
1 yellow head sleeper goby
1 6 lined wrasse
4 different damsels (evil fish, mean little buggers, wanna get rid of some)
1 fire shrimp (awesome looking)
2 skunk cleaner shrimp (nevr though shrimp had personalities. They will eat from my hand, actually hop onto my hand and take the food from my fingers)
1 peppermint shrimp
Bunch of different types of snails
3 Florida fighting conch (they don't fight, dunno where that came from, but they do jump)
a dozen blue legged hermit crabs
a hammer coral
a torch coral frag.
a colt coral
2 star polyp corals of different colors
8 hairy mushroom coral polyps on a single rock.
and in QT right now are 5 blue/green chromis, which are schooling/shoaling small fish.
I really enjoy it, hope yours works out well
