Congrats on taking that huge step to building a new you.
If you stick with it the results will amaze you!
I did have one other thought to add to the other excellent comments. Be careful you don't get so excited in the early days of going to the gym that you burn out later and don't stick with it.
I am definitely talking from experience here. I have joined gyms with the best of intentions several times over the years only to fade away with time. In truth, as I eventually discovered, I am not much of a gym-rat, (if it isn't outdoors, it isn't exercise) but I love lifting. So I found a compromise with CrossFit. And there is no doubt that it has change my life... just as Abby stated.