Yes, welcome!
You will want both underwater and floating plants, plus some marginals or bog plants. Oh, and after searching the threads here, and looking at all the photos, you will surely want some lilies!
Some underwater plants are hornwort, and anachras. Floating plants include water hyacinth (which blooms, in purple), duckweed. None of these need to be in soil or gravel.
There are all sorts of marginals, like sweet flag, taro, parrot feather, money wort and penny wort, iris, sedge, oh heck - zillions. These plants are meant to be planted in soil or gravel, either in pots placed where they will be wet but not under water, or planted along the edges of the pond, in a bog-like setting.
Lilies go in soil (clay) in pots and are set on the bottom of the pond, at heights particular to each variety of lily.