from my experience there are "super fish stores" "fish stores" and "core fish stores"
-Super stores stock the basics, and give "decent" advice for complete beginners. Petsmart, petco, etc.
-Fish stores are pretty good about info, but theres always one or two employees who are terrible, so you get burned every once in a while when completely uniformed about something. If you show them you know what you are talking about, they are helpful.
-Core fish stores are run by people who are completely engulfed in fish keeping. Generally these stores are saltwater, and generally, you end up blowing a lot of money at them on quality livestock and corals.
Oh and my favorites are Danios and Neon tetras. I like small fish.