Ok... I see that no one has answered your questions so i might as well.
Plated lizards require UVB no matter what. Get a 5.0 or higher. I recommend either Zoo Med 8.0 or Repti Sun 10.0 For desert species. For the substrate you should use a sandy soily mix that can retain moisture somewhat well and they love digging. For a basking area in the cage you should have a 100 - 150 watt bulb if there is at least 18 inches in between the animal and the bulb. If under a 10-12 inch distance you should use a 75 watt tight beam bulb.
Determining the gender of your lizard depends on the species. It sounds like a black lined to me but i havent seen it. Make sure you provide it plenty of water and hiding spots. If he is always hiding from the light then it is to warm, If he is always directly under the light then it is too cool. That size cage may be good for now. How Long is the lizard?

Any more Questions??

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