Advice please

I am just beginning the process. My (ex)husband and I are working together and are very amicable, but I need help understanding what I can do timeline wise. I live in Wisconsin for reference. He makes about double what I do and we have already discussed child support. My main question is, can I start to apply for assistance before our divorce is finished? And can I do anything with that before moving out? I can’t really afford to move out until I have assistance in place. From what research I was able to do I believe I should qualify for most if not all of assistance offered. Any tips or advice is welcome. TIA