Planted tanks can be as simple or high tech as you want. If you want to use the lights you have now you need to post what they are and what type bulbs. They will "probably" be suitable for low light tolerant plants such as Anubia, Java Ferns, Bolbitus, and Crypts. Research those plants and their requirements and see what you would need to have them in your tank. You can't get much easier than that to start. Then you can upgrade lighting and plants later on if you want.