I know how overwhelming it is to start as I've been there, and am still a work in progress. But when you think about it, we
all are, even those that have made it goal.
I remember how exhausted I constantly was at 360 pounds. How difficult it was just to even get up out of a chair, how painful my feet would get from just standing for a few minutes, how I'd be out of breath just by walking from one end of the room to the other. People are quick to say lazy, but I'd like to see anyone bounce around with glee while having an extra 200 pounds constantly strapped to them.
I took baby steps to start out with, which seems to be what works best for a lot of people. I tried concentrating on eating a lot of veggies before anything else at every meal and getting at least a little exercise in each day, even if it was just walking. No more soda, no more added sugar. I went through horrible withdrawals, but by concentrating on just one meal at a time and getting through one day at a time, things slowly got easier. I realized I had no choice if I ever wanted to feel better. Nearly 150 pounds later, I'm still working through this one meal at a time, one day at a time, one routine at a time. And you can do it too! Look for the positive in everything. Set yourself goals (even small ones!) and write them down; make sure you include plenty of NSV (non scale victory) goals and turn it into a fun game. Stick around here and do a lot of reading and posting. Every step in the right direction, even the teeniest of baby steps, will bring you closer to better health. Do whatever it takes to stay accountable (we all find different methods that work best for us), and your new MFP account is a great start.
And most importantly, be kind to yourself. We've all been there, we all know how hard it can be. Which is why we're here to help . . . most of us are still finding our own path.