Welcome to another tall chick!
Like the others have said, this has to be a long-term life change and it won't happen overnight. The longest journey starts with a single step, right?
That being said, the idea of finding a routine is great advice. Figure out if you can count calories (which I find very easy) or if you'd rather try a different approach. Figure out when you can devote time to exercise and stick with it. It's all about building a pattern of good behavior that you can fall into and stick with!
As for motivation, think of all the reasons you want to reach your goal weight. I bet they are really good motivation in and of themselves. Whenever I *really* don't feel like running on the treadmill or *really* want that bagel even though I'm out of calories for the day, I think of all the beautiful clothes I want to be able to wear and it helps me stick with my plan.
This place is a great place for support, ideas and realizing that you're not alone in the struggle. Welcome.