Welcome! This is a really great group of women. We all have different starting weights, different programs, but there is always great support here. There's a bunch of stickied threads at the beginning of this forum which can help you get started.
There's also two weekly threads where we tend to hang out. I hang out in the "over 40" thread because a. I'm over 40

and b. it is a little more managable for me than the main thread. But, I do lurk on the main thread as time permits, and occasionally post.
The main thing to know is that you are not alone and that you can do this.
Welcome!