Welcome to our forum.
Sorry, I don't know any particular resources to recommend, but see the search menu at the top of this window; you can do tag searches as well. You might try something like a search for "amicable separation." You could google that as well.
Is there likely to be a divorce here? Do you and your husband both want the separation to be amicable? If so, then you have an important goal in common.
I hope Polyamory.com proves to be helpful for you.
Love means never having to say, "Put down that meat cleaver!"