my 2cents
bristle worms are not too bad to have they are actually quite beneficial and especially since you are just starting they will take care of any over feeding you may do. so don't do the six line just yet plus they are satan incarnate to any fish added after them.
clowns are awesome beginners, very hardy, nice to look at and active especially in pairs.
if you want an anemone please wait for your tank to be a little more established before adding one, i made that mistake. since the tank is still new there are a lot of factors that could lead to the anemones downfall. not to mention since its still new youre probably going to be moving things around for a while, till you find an aquascape you really like. And when it comes to corals they don't like to be moved.
so percs or oscellaris all the way then maybe a single fire fish or purple one, chromis are great beginners especially in small shoals.
look into a watchman goby/pistol shrimp combo. very entertaining, don't require much room, keep to themselves! if you find a fish that you really like but has aggressive tendencies. hold off till you have other fish you wanted also. six lines, pygmyangels, dottybacks, some blennies, great for small tanks but once they've made something their territory...its a wrap! just do some research before a purchase and you'll be a ok!
