Motivation comes from within, though we Sparkpeople can give you all the support that you need. Start a Sparkpage and start blogging about why you are in this. Why do you want to lose weight? How do you plan to do it? How will you reward yourself along the way?
A sparkpage has the added benefit of allowing others to 'friend' you and to offer you personal encouragement and support.
When you have questions, be sure to ask. Someone is here 24/7/365 to help. And no question is stupid. The site can be overwhelming at first.
You took the first step; let us help you on your journey.