Two great places to start;.. tegutalk.com and thetegu.com has all the basic info you need to know and then some. As far as care,.. once you learn what you need too and get into a routine like everything else it's not that difficult. If you haven't already, decide on what kind of tegu you want since there are quite a few to choose from. Whether or not you have the space to house a large tegu with a minimum requirement of 8ft x 3ft x 3ft enclosure for just One of the larger species. Does a tegu fit into your lifestyle since they are long term care pets that require a lot of time and space for handling. To get that large calm tegu that a lot of people want when they see it.
But fail to realize how much that person put into it to get it that way. Yes they grow fast, not every species hibernates and when they don't they grow even faster. Reaching well above 3ft withing their first year
Colombians are the smallest and have a bad rep but they can be just as tame if not tamer than some of the larger tegus. They may or may not require more work handling than other species. They have different personalities and quirks just like any other animal, people included.
Good luck,.. I hope everything works out, because they are great pets. I feel the same way about them as I do my Bullies,..I will always have at least one.