Finally starting...

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I've been "trying" to lose weight for 7 months now, my youngest is now crawling and furniture walking and I think its time to get rid of this baby weight...so I call it, it really has just turned into weight now. I've given birth to 4 babies in the span of 3 1/2 years no multiple births. I've been pregnant for what feels like a life time and I don't even remember my body before having kids. SOOO I want to start now before I give up.
Are there any good challenges or groups that I can join to help keep me on track? :) thanks in advance.