WELCOME!!!!
Like the others have said, definitely look around on here at the different programs and see which one would fit your lifestyle best. I highly recommend looking into Trim Healthy Mama as well!! It was established publicly in 2012 and has yielded wonderful results! I am doing Trim Healthy Mama and it's doing amazing things for me. But that is just one of so many programs out there! Research everything and go from there!
edit:
I want to add that I, too, have over 100 pounds to lose!