Here is a video about their care by Clint’s reptiles;
Make sure you let them settle in for a couple weeks before handling them at all. Also, they are omnivores and need more than just bugs. Fresh fruit/veggies are good for them. You may wanna make sure it is 100% an Argentine B/W tegu as well, because many times from pet stores they will have blue tegus listed as B/W tegus. And they are hard to tell apart.