Are you intending for a high tech one(with Co2 and high lighting) or just a simple one? If you are going for a simple easy to maintain one, then i reccomend plants like anubias, java fern some nanas and maybe even java moss tied to drift wood. For tall plants maybe you would like to try hydrilla, cabomba and water wysteria. These plants should be able to thrive in a tank with about 3 to 5 ppm of Co2 which can be easily attained by not having any surface disturbances on the water top. However i dont think UGFs are suitable for a planted tank as the plants are unable to root properly and also fertilizers cannot be applied. In easy maintenance planted tanks, shorter periods of lighting are required, like maybe 6 hrs only and regular water changes needs to be carried out to remove excess nitrate, ammonia, nitrite so that it does not cause an algae bloom.
If you really want to cover your whole floor with short plants then hair grass or e tannelus, but these require Co2 and average lightings. I havent tried then without Co2 tho so maybe it can be done.