FIRST - DO RESEARCH, DO RESEARCH, DO RESEARCH!!!! There is alot that goes into a planted tank - lights, fertilizers, care etc....
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Per you questions:
You can use straight flourite. I would not overlay it with sand because in time the sand will sink to the bottom of the flourite. This is not to say you can not overlay it with sand, but seems to me as counterproductive because it will be at the bottom over a period of time. As per recommendations, I am trying a small dusting of peat below the flourite in my 5.5G (per djlen). This will be my first time with peat.
Also, from the posts above I was asking the same thing on lights. Make sure you have enought watts. 8 watts will not be enough - most likely. Are the lights Compact Fluorescent (CF), Nomal Output (NO)? If can get a hood that is incadescent, get a screw in CF bulb (could be found for about $10 or so). If it is 18+Watts you can grow most plants. You can probably get away with some really low light plants with the 8 watts, but I can not make that call. Someone more experienced will have to help you on that.
With more watts comes the need fore more nutrients (see
Informal FAQ ) This means that the more watts the more plants will grow and the more nutrients they will need which means you will need to dose fertilizers more.
Starter plants I really dont know. Most abubias's are slow growing and recommended for a low light low tech tank. Java fern and java moss I hear are hard to kill as so are some cryptornyes. What I suggest doing is getting a list of plants you want to keep (look at pictures on the web) and see what they demand per light and nutrients. Then build the tank around the plants you want. Some plants are heavy water feeders, some are substrate feeders. In general, the more red the plant, the more light it will like. This is a generalization and not a rule. Some places to help with pictures are aquabotanic.com and aquariumplants.com. There are many other places as well - just google aquarium plants.
My 5.5G tanks specs will be
AC 20 Power Filter
Tronic 50W heater
Flourite substrate with a peat dusting
Perfecto Incadescent hood with a 23W - 28W CF screw in bulb
I think that is it.....
There is a lot more to balancing a planted tank - just read the posts here and you will get a plethera of information!!!!
Good luck
Aries