Sorry for the late reply. I went to pick him up the weekend after writing the first post. He hasn't had much socialization in the past, so he whips his tail at me quite a bit but he seems calm if I hold him still. I have him in a 30ish gallon for now (he's still a bit small) and we're building him something larger in a couple of days. He's a bit of a picky eater but I'm trying to figure everything out. A few more questions

Also mine is a saharan uromastyx.
What's their usual favorite foods?
Do I not keep a water dish in their tank? I read that it's bad for them, so took it out. He hasn't had one for a while and seems to be doing fine but I'm still not sure about it and would prefer someone more experienced to give an opinion.
What's their usual size to be around at full size?
And how do I check for gender?