Well first off welcome to the forum.
In order for us to help we need some things!
Do you know what cycling is?
Can you post your water parameters for us?
Can you post your tank size for us?
The fish you listed are schooling fish, so they won't be happy without others of their kind.
Don't listen to advice from your fish store. They don't know anything usually.
MABJ's iDevice used for this message :p