and congratulations on your new collared pal ! They are a fun little lizard to watch, and get very tame with daily handling!
You have a heat lamp, temps should be 100 - 105 basking and high 80's - 90 the rest of tank. They like it Hot! 
Also need a uvb flouresent light.
Yes they need daily water, either in a shallow saucer or dripped from above, On the screed an ice cube can melt down on to a rock, for them to lick naturally.
Or a paper cup with a pin hole in the bottom achieves the same thing.
Most do NOT like veggies of fruit, but I do provide some tiny pieces of greens shredded apple and things. Some pick at it soem do not.
*** BIG bug eaters. Crickets mainly, superworms , waxworms, moths
dust with calcium powder, I use miner-all.
Here is a a couple of sites, one owned by our forum buddy Will Wells, plenty of info and pics
http://www.mountainboomer.com/crotaphytus/
Here is another with good info I like also.
http://www.collaredlizard.com/articles.htm
Wish ya a ton of luck, ask questions anytime, great bunch here, we love talkin collareds, hehehehhe ! 
Also when you get a chance post a pic so we know who we are talking about 
-----
___
Eve