The tank you mentioned is the one I would suggest for what you want to keep. That's 180G if you didn't already know.
There is a small problem though, I'm not sure which puffer you mean, so I can't comment except if it is a puffer it will eat inverts you place in the tank. And the Clownfish (Nemos) will definitely become a nice snack for almost any eel you might add.
From the fish you listed it's looking like you're wanting a predator tank, in which case bigger is better because most predators are larger fish.
The anemone would have to be a much later addition if you really want one. As they require a very established system and intense lighting.
What it looks like here is you want a tank, but have decided to research first, which I very much commend you on. But now it becomes what you want out of it, what fish you like and what type of tank whether it be a Reef, FOWLR
(fish only with live rock), or FO
(fish only). Then we can begin to help you further on suggesting fish and whatnot. Sidenote: puffers aren't reef safe so if you wanted a reef and the puffer, that couldn't happen.
Try searching through here
and looking at requirements that are the same, like if you like more reef-safe fish than non reef-safe, ones with larger tank size requirements or smaller, etc.
Welcome to AA!