as a tank I know how, depending on size of tank, the more light the better, however if going MH you need to have fans running past the light to dissipate heat, pain't atleast 3 of the inside walls with a glossy white water proof paint. get a humidifier and egg crate, 5x 2" long pvc pipe cuttings, and 1 6 inch or more pipe for filling the reservoir. you'll also want a fine mesh to cover the egg crate so soil doesnt go through, high grade potting soil, organic preferred, or even better is aquasoil or fluval stratum, cute the egg crate to fit fairly snug in your tank, break a hole through the crate to fit the pvc diameter of your choice, this is where the filling pipe will go, silicone the pipe to where the bottom just passes the bottom of your egg crate, now silicone or glue the 2" pvc parts to the bottom of your egg crate in a way where it will support the soil, so one in the middle and 1 in each corner, with about 3 inches from each side of the tank, you can place dolomite or osmocote or osmocote plus in the tank before you install the eggcrate but it isn't needed if you have good soil, next put in the covered raised eggcrate with the tall pipe pointing up, make sure no soil can go into the water reservoir through any cracks, this is easy by adding another piece of mesh that goes slightly up the walls of the tank, then place your soil down on the egg crate to a thickness of about 3-4 inches, make sure it is uniform next on the outside of the tank, if you left a pane of glass empty draw a solid line parallel to the ground, this doens't need to be larger than an inch, about 2 inches bellow the surface of your soil, this is your fill line and you shouldn't fill much higher than this, very similar idea in another emersed project. you can choose to section parts of the tank off with thin acrylic if you want to grow more than one plant.
Next choose your lighting, set it up on a timer for 12 hours a day and set your humidifier on for 15 minutes per hour, make sure there is a somewhat seal on top of the tank but not enough of a seal as to be air tight, just enough to keep the humidity in and not on your lights, this can be done with a sheet of acrylic on a wooden frame which you can make fit around your tank perfectly so the sheet of acrylic doesnt move, make sure the acrylic is pretty thin.
a bonus is a paintball co2 system but it isn't really necessary as there is alot of co2 in the air