You don't know how lucky you are to actually be able to hold your white-lined gecko

I can't hold mine at all (but I intend to fix that whenever I get around to moving his terrarium to another room).
For caging, I feel a bit embaressed to say I don't keep my gecko in a vertical set-up. Pepe's terrarium is a 35 gallon long terrarium with a floorspace of 36"x12.5" and a height of 19" so it could definately be higher. However, from actually watching Pepe, the height of the enclosure doesn't seem to be as important for glass-climbing geckos as does "glass space." I.e. the more glass they have to climb on, the happier they will be. It is sort of like floor space for a terrestrial lizard because the gecko treats it as such.
For substrate I use newspaper to soak up excess water from misting, then I cover it with a somewhat thin (just enough to cover the newspaper) blanket of Reptibark to keep it looking natural. This is probably more important for me than it is for you because my white-lined gecko was probably wild-caught.
For lighting and heating I use a 100 watt heat bulb which I leave on all the time (even at night) and a lamp with two 25 watt linear rainforest Dayglo bulbs from Exo-terra which I leave on during the day to supply extra heat but which I turn off at night.
For humidity I mist atleast twice a day with one of those spritzers that has a water reservoir and a pump, and that emits a lot of water with each spray. I mist moderately in the morning (or whenever I wake up

) and lightly in the evening before I give Pepe his crickets.
That's about it from me. If you want any more hints or advice on what I do, you can ask here and I'll try my best to reply.