Hi! Welcome to SP! This is a great site - lots of resources and great people ready to support and encourage you!
You're off to a great start - you've designed your page and joined some teams. So I'll just make a few suggestions...
Posting on the message boards of your teams is a great way to meet people and make friends that will help keep you motivated. Being active on the site helps keep you focused.
And the secret to success is consistency... Don't try to do too much all at once... pick a few things you can stick to, like tracking your food and exercising at least 15 minutes a day...then you can add more as you feel ready.