I would never feed hotdogs or other processed meats.
I raised my Arg B&W and the Arg Reds on cut up fruits, small rodents, ground turkey(with supplements), eggs(mostly raw eggs for mine). The fruits should not include citrus, banana, or pineapple. Mine tended towards apples and grapes, although any in season fruits are good.
They do need a high basking temp, and make sure you get the right UV type bulbs as well. Tegus like dirt, but I moved mine to mulch instead, and they seem to like it fine too.
Handling them is necasary, but you must do it in a way to form a good bond. Build a trust between you and you'll have a wonderful pet.
All of the above advice is from MY experiance with MY tegus, who are healthy and doing well. There are some good caresheets out there as well.
Make certain you understand the cost of feeding a large lizard, and that you're certain you can care for one for the next decade. Re-homing a large lizard is sometimes problematic.
I love my tegus, and personally I reccoment them for pets instead of any of the monitors. They just seem to have more personality.