Some things are about the same no matter what. After separation it seems that from time to time, things come up that need contact besides kids. If you discussed the purpose of the separation and some ground rules up front it helps but people rarely do that. So it has to be done. So start by asking yourself what the purpose - i e what are you hoping it will accomplish? What are the small steps to show progress? How will you both know it is time to reunite?
Questions usually come up about contact? DAting? Asking for help when things come up or calling when you want to share something. It is kind of hard to suddenly cut off - so think about these things because it gets muddy. What are the terms of talking to family - for instance, right after my H moved out his S's had a gathering and he called to make arrangements for me to go until I reminded him that his S's may not be comfortable. Then when one SS got engaged he called, the other SS got pregnant, the holidays came up etc. Then there were the plumbing problems, serious illness/ hospitalization/accidents etc. All tough decisions depending on the circumstances.
Goals will help a lot. ARe you in MC or IC? That may help also with goals.