Struggling to organize my thoughts...

So last night I sat down to work through some of my Unit Plan. I succeeded in muddying my notebook with a bunch of ideas that all seem pretty scattered. I was wondering if any had any suggestions on how to sort of organize my thoughts? I'm almost unsure of where to go next and what to start putting down into my Google Doc. I have so many ideas, but I'm not entirely sure which are plausible, which aren't as relevant, and which are exactly what I'm looking for. Anyone else struggle with this?