Hello There~

Welcome. 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!