Welcome!
Cherber and MyBody are dead on

You have made the most important step, and that is simply the DECISION to get healthy.
I do calorie counting coupled with clean eating (you can Google that, but basically it means, super healthy foods and not partaking in crappy eating) and it has worked WONDERS for me, and honestly hasn't been too terribly hard once I made the decision and I continue to stick with it.
Whichever path you take, just remember that everything you eat from here out is a choice, and each choice has consequences, good or bad. And hey, if you mess up one meal or one day or one week, that is no reason to give up. Just start making healthy choices again.
We are here for you!