Welcome Jess!
Feel free to post what equipment (lighting) you got and what your plans are for the tank (low tech, high tech, going to use powdered fertilizers, co2 or excel, type of plants?, etc), then other's can suggest what plants to get.
The For Sale section on this forum is one of the best places to buy plants from. (get suggestions to make sure you only get plants that would do well in your tank set up).