Hey world!!

Hello and welcome to MFP!
If you’re just starting out I’d recommend reading these two threads as they contain good, honest information that will set you on the right track:

http://community.myfitnesspal.com/en/discussion/1235566/so-youre-new-here/p1

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

Good luck!

If you are only going to lose 8 pounds, I doubt that you'll lose much, if any, muscle mass. Folks, like me, who have lost a lot of weight also lose muscle mass; it's unavoidable. What I do to counter it is lift weights and make sure I get enough protein.