New Leopard Gecko rescue

Hi! Well, a lady at work brought this to me and as this is my first gecko, I think its pretty skinny. Basically no background info other than it's had an eyelid that won't open all it's life and it came from her niece. It's about 6.5 inches long. What do you guys think? Also, it's currently on sand (what she brought him in), I'm not fan...what do you use? It eats really well, very "tame" (for lack of a better word).