Advice
Although I understand not every firm is as close knit as GTM, at any firm, if there are firm events, lunch n' learns, or whatever else is offered by the firm I'd strongly recommend going and enjoying yourself. Work is about getting the job done, but if a firm like GTM is willing to treat their employees you should enjoy the fruits of your labor. From sporting events, to BBQs, to lunch n' learns, and everything in between, GTM really showed me they care about their employees as if you are family and that is a priceless token of appreciation you may not find everywhere.
Along with that, ask all the questions you have no matter how small. The only mistake you can make is not asking questions, because everyone is willing to help you and that is so important especially as a new comer.