Hi Angelia
Welcome! Just cruise around the site for a while and you'll get the hang of it. Everyone here is fantastic with all sorts of great advice!
Where to start....
Well, I always tell people the best way to start is with baby steps. Change a few things at a time, and when you're comfortable with those changes, work on some other things. Many people here use fitday.com to track their daily calories. Do you have a specific plan in mind, or are you doing it "on your own?" (That's what I'm doing). What kind of exercise are you planning?