With plants there are tons of great choices that are easy to get grow. Vals, crypts, anubias, java fern, dwarf sag, hygrophila corymbosa, ludwigia, rotala rotundifolia (indica is almost always the same thing), anacharis, hornwort (personally I hate it, it sheds needles like crazy, good floating though, but the needles shedding can cause bacteria and the corie's barbels could become infected), water wisteria, water sprite, pennywort, java moss, dwarf pygmy chain sword are all great choices. I have grown all these besides pygmy chain, vals (my tanks aren't tall, but it is a great background plant) and water sprite. Some people say rotala is hard, but my up stairs neighbor, still a newbie, is growing his strong. Ludwigia can be picky, but just give it a spot underneath the bulb and it should do alright.
If you don't have a plant bulb you will need one. 6500k is usually the best to go with, just find it in your size bulb and length. If you have the hoods that come with most kits you will have a T8 bulb, it is one tube and it is fat around, don't get T5 as those won't fit. So with live plants you also need fertilizers to keep the tank going on track and keep growth steady. Seachem Flourish is great for micro nutrients, then you should have a source of Potassium, Seachem Flourish Potassium is great as well. Those two I would view as manditory. Another one you may want to look into is iron. Plants like rotala, ludwigia, and those other reddish plants will either turn red or maintain a nice healthy red color. This makes great contrasts. Also, some plants are root feeders, like swords, crypts, vals, they don't require it, but if you want them to grow faster and healthier you could get Seachem Root Tabs. This provides most nutrients right at their roots and also encourages root growth from these plants. All of these can be found on Amazon and would most likely be cheaper going through Amazon as you also get free super saver shipping.
If you have any questions you can always private message me and I can help you.