hiyas!
I had a pair of sand geckos a few years ago..I'll try to find you a few caresheets when i get home from work. One thing you should keep in mind if you are going to house them in a tank with silicone is that mine could climb up and slip through the screened top. (the top had larger holes..) so you'll wanna make sure you get a fine screen mesh on top.
Another thing i found hard was watering them and finding small enough crix! .....Never did work out a good way for that. Make sure you find a good pinhead crix supplier for sure
Good luck with your little guys... they are incrediably awesome to keep.