Hey - welcome to the forum and the start down the slippery but fun slope. I just start up again after a many year hiatus due to job relocations, etc with a new 10 gallon tank. Learning about and understanding the chemical and biological interplay within the tank environment is really enjoyable (if you're wired that way - lol).
Before moving to Boston, I lived in the Phila area so perhaps not to far from you in South Jersey. Have you found any good local fish stores? I've actually had some good success with Petsmart, but I like to support the local guys.
For your office tank, you might want to consider a Bolivian Ram. Mine do fine in a ten gallon and they are very entertaining. Their colors become more pronounced once they've settled into a new environment and they tend to be more tolerant of variable water conditions.