I’m not sure what you have now would be good for any of those lizards. Lizards would need top down heat like a heat lamp and maybe UVB lighting. Your tank might be okay for a bearded dragon as a baby if you can figure our how to safely heat it. They need it hot.
I’ve bred crested geckos and they make awesome pets. You’d really only need a 20 gallon tank, with a screen lid, turned on it’s side. Throw in some things to climb on and hide in and your good. Temps only need to be around 80, so a low wattage bulb is all you’d need. Being nocturnal, they really don’t need a UVB light. They eat a powdered diet with insects added once week or so. I’ve had some that wouldn’t eat insects. When they are adults they are pretty easy to handle.