First day!

Welcome Jennifer! There are lots of great resources to help you on your way. Check out the stickies (most helpful posts) at the top of the forum boards. Great, to-the-point info to help you cut through the BS and avoid many of the pitfalls people make when they first start out. Helped me a lot when I first logged on to MFP. Here are three of my favorites:

https://community.myfitnesspal.com/en/discussion/1080242/a-guide-to-get-you-started-on-your-path-to-sexypants/p1

http://physiqonomics.com/the-weird-and-highly-annoying-world-of-scale-weight-and-fluctuations/

https://community.myfitnesspal.com/en/discussion/10634517/you-dont-use-a-food-scale/p1

Good luck!