hi and welcome to the forum
1. I use hydroballs and substrate divider but with ABG mix ontop but it depends on what plants you're having.also using the hydroballs etc isnt called a false bottom,a false bottom is when you use egg crate stood on pipes to to allow the water to stand at the bottom,there are loads of threads regarding the construction of them
2. sorry cant help here but I have my two auratus in an exo terra 60x45x60cm
3.Pothos is great and really hardy,bromeliads,crepping fig ,the list goes on.
4.I have 3 bulbs in my compact top the exo terra 2.0 which is really just for the plants,the 5.0 which emits a bit of heat and uv and finally an exo terra daylight basking spot 25w but i only turn it on if the vivarium is relly cold as it tends to dry it out really quick,so you may not need it depending on how warm the viv gets as you can always use a heat mat or ceramic heater(i've never used the ceramic bulb so cant really give you much advice)
hope this helps