to SP! This really is a great site... lots of resources to help you reach your goal and loads of wonderful people ready to support you!
You're already off to a good start! You've designed you home page, and joined a few teams. Posting on the message boards of your teams is a great way to meet people and make friends. Personally, I find that my Spark friends are my biggest motivation!
Two really important things that will help you are to track your food every day, and to commit to at least 15 minutes of exercise daily... you can increase that when you're ready.
Good luck and remember,