Getting a new Uro, and getting the set up correct can be a daunting task. Definitely an expensive one. I would unequivocally recommend following the deer ferns care sheet over what the pet store told you. There are some things that are debated topics with Uro care such as types of substrates; but feeding Romaine, and using heat rocks are not 2 of them. The most important thing right now is to get your Uro proper temperature gradients set up and proper food. Unfortunately it is impossible to get a proper gradient in a 10 gallon tank, however, there is a cheap alternative until you get a different tank, a large rubbermaid container, usually about $10, can serve as a suitable home. Given the age of your Uro, I would put him on paper towel substrate, then you can either clip the lights (definitely plural), or my preference would be to get a screen to lay over the top that you can put the lights on, similar to what you are doing now. In order for your Uro to digest its food it really must have a basking spot of about 120 degrees, the cool temps are *slightly* "fudge-able" for a short time period as long as he has a place to warm up. If you get a basking spot up to 120 in a 10 gallon tank, you may end up with roast lizard. 
As for the food, start by following Doug's advice on the care sheet. Romaine lettuce is better than iceburg lettuce, but that really isn't saying much. They both have too much water, and almost no nutrients.
The running and hissing will probably go away in time, and as you get his set up correct. Does he have a hide? This is imperative to his sense of well-being and safety, also he may need to be in a place with low foot traffic. The Uros can take a while to acclimate to new places, and the more stress (environmental, physical, or emotional) there is, the longer it will take.
There is a LOT of experience and knowledge represented on this forum, so feel free to ask a lot of questions. We enjoy helping people make happy homes for their Uros, and that way both you and your Uro will be able to enjoy each other. 
There is a lot more to say on the topic of Uro care, but that is a good palce to start I think. 
Sincerest Regards,
Elizabeth

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