First, welcome back
There is lots of support and help here, so just jump right in. As for the mini challenges. I dont think there are any right now, but go ahead and start one up if you like, others will very likely join you. Its always nice to have company on our quests.
Something my dh reminded me today......you just have to get thru today. Dont worry about next week next month or even tomorrow. Pick your plan, and just get thru today.