First, read the stickies about planted tanks - there's a lot of info that is going to help you grow in the hobby of planted aquariums. But also know, we are ALL constantly learning new things about planted tanks. Just make sure to have patience, and be willing to make mistakes along the way. It's very rewarding once you create something beautiful.
My suggestions would be to (1) make sure you have adequate lighting and (2) get some plant fertilizers.
HarleyK mentioned using the compact fluorescents on a 10 gallon tank. I actually use the same watt to gallon ratio and have had tremendous success. I get the light bulbs from Walmart. They're 20 watt GE 6700K bulbs that come in a two pack for less than $10 (Plants need a light spectrum b/n 5500K and 10,000K so this works well). I would imagine for your 16 gallon tank, you could probably do just fine using two bulbs as well (the extra 6 gallons isn't going to make too much of a difference).
Regarding plant fertilizers, at some point you're probably going to want to purchase a plant supplement you put in the water. For the plants you're growing, I would recommend Seachem Flourish. You can grab a long-lasting bottle for around $6-7 and the product provides minerals that plants need to thrive. You've already made a good start with using Flourite, but it doesn't provide all that plants need. That's where the Flourish comes in.
Other than that, it looks great so far! Keep posting your progress and feel free to ask more questions!
