it all depends on your lighting, rule of thumb is 2 watts/gallon of a flourescent bulb something from 5000-7000K with 6500 being average.
what is in my tank right now is:: Moneywort, anarchis, aquatic banana, and rotala indica, and java fern, and frogbit. They are all pretty nice plants, easy to care for although I wouldnt recommend rotala of any species because it seems to be pretty fragile.
What I have ordered:: anubias nana, pellia, lace java fern, java moss, hornwort, water sprite, water wisteria, and giant duckweed. -- bought all these because they are low to moderate light plants, pretty good beginner plants, and all but the duckweed and hornwort come highly recommended (duckweed covers the tank pretty fast and hornwort sheds its leaves too easily)
I suggest to start out with stem plants, and maybe some anubias and java fern.
I am also a beginner plant keeper so I cant give too much advice, but this is what I have that works for me and what I ordered because I think it'll work for me.