Welcome to the forum. It sounds like you're on the right track. Just don't make too many changes too quickly or you might get overwhelmed and disillusioned- just do it gradually.
A few suggestions for staying motivated:
Set some measurable and attainable goals such as how much you want to lose and when by. Work out how you will do it. Write up a plan, and stick to it as much as possible.
Start your own thread in the "Personal Progress" sub board and regularly report there.
Read the articles on the main website (the links are on the purple menu bar at the top of the website).
Participate in the forum.
Only you can change yourself - no one will do it for you. When you take a course of action such as changing the way you eat and live it's something you just have to keep on doing. And if you lapse into some bad habits one day, just brush it off and get back on the wagon once you've got over it. Weight loss (and all the other positive changes that accompany it) does not happen overnight, but it DOES happen eventually.
One final, and important piece of advice, paraphrased from Sir Winston Churchill:
"Never, never, never, never give in!"