ok i recomend what Ken said, make sure you study the plants before buying them, but since you bought them, make sure your prepared when they arrive, i just ordered myself some plants and am getting ready buy buying higher wattage bulbs, (i have a 25 gallon tall tank) and you need some fertalizer, i recomend both dirt, and liquid, i use "PlantGRO- iron inriched" i recomend using something with lots of iron, the more the better, and make sure they have lots of nutrients, and it is safe with fish..... i paid like 5$ for mine at my local petsmart...
but if i were you and you sounded like you have several plants get some enriched dirt fertalizer, also at your local petsmart, and get lots of stuff to set up so you have it nice and ready for your plants.... just ask employees at petsmart, or your LFS.....