We definitely need pictures of the plants to ID them.
If they came in pots, they are ~probably~ root feeders, meaning you can plant them as you would a garden plant. However, there are some plants that rot when planted and need to be floated or tied to drift wood or rocks. With root feeders, you are most likely going to need fertilizers, unless doing an NPT (do not attempt an NPT without having proper lighting - correct wpg and 6500K - as the system will collapse and leave you with a mess).
You don't need soil to grow plants - I've got tanks with gravel and tanks with sand and the plants will grow fine in either one, but will need root tabs or liquid ferts.
The only cure for ignorance is education, and bullying or attacking someone is no way to educate them.