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I just got my first aquarium up and running last Friday and got fish on Monday . I got 2 Mollies (Snowflake and Tony) and one Dwarf Gourami (Marty). My GF named them lol.
Fish stores will sell you anything and say anything to make a sale often times. Mollies, especially the females, get quite large. I usually don't advise them for anything under 30 gallons.
One of the most important pieces of equipment you should have is an API master test kit. You need to make sure that ammonia especially, is kept within reasonable limits, or your fish will die.