In the planning stages, many questions.

for live rock you can just buy about 10 pounds at the local fish store or ask to see what 15 pounds would be and go from there.2-3 clowns maybe a goby and a firefish goby a blenny just keep small fish. its probley going to take a month or more for the tank to cycle. then you could add corals/fish

 

I have had my 24 gal nano cube for 3 years and love it. I'm sure your love your nano tank as well. However, I do caution you with the anemones. They dont like staying in one spot so they will detach themselves and float around the aquarium stinging anything in their path (maybe even a shrimp? I don't know) until finding a perch. Also, I have 1 cleaner shrimp in my tank and he's always in the front, full of character so I don't think you need more than that. third, why not get some more fish than just two clowns? Isn't that the point of an aquarium is to have fish? There are many hardy species out there in the aquatic world, you don't have to have a tang or lionfish. Here are some quick picks I recommend that will had a lot of color: yellow watchman goby, sixline wrasse, flame hawkfish, flame angelfish, lemon peel angelfish, royal gramma. Have fun with your new tank! Remember "take it slow, let it grow".

Also, don't be scared to find yourself attracted to coral because it is my hunch that you'll be wanting to get some after a year or two in the hobby .