hi, no probs.
if you are gonna have Goldfish then you need tough and hardy plants. as goldfish will eat most plants.
I would suggest, Amazon Swords, Giant vallis, Onion Plant, Java Fern, and Anubias, as theya really tough and do ok in coldwater.
For Sand i use play pit sand. alot cheaper than aquarium sand - its just needs more washing before going in.