Welcome to 3FC!
There are a lot of really helpful and knowledgable people here. I'm sure you'll find the support you need.
Since you have a significant amount of weight to lose, I suggest checking out the "100 lb. club" folder, under support groups. There are also the folders separated by age group and stuff.
Have you picked a specific food or exercise plan? It helps to be specific about what exactly you want to do. Someone who says they're going to "eat healthy" is probably going to have a harder time losing weight than someone who decides to calorie-count, or cut carbs, or join WW or something. Exercise is also pretty important; it doesn't have to be huge, even starting out with just a half hour's brisk walking every other day or something is a great start.
Once you've decided more specifically what you're going to do, I'd suggest you look around and find the specific forum for those plans, those are a great place to get advice from people who are doing the same thing.
Again, welcome to 3FC - you're off to a good start!