I didn't tell him anything I put them in place. I started by putting his shoes outside in the porch, then looked the door so he couldn't go as it pleased him (in case he'd want to challenge I'd have said to him that he has his own house keys, but never got to that), then after my horrible fight I needed to protect myself emotionally so I texted him saying that I'd drop the kids to him. When I did that I didn't think if it was bringing me closer to my goal as I felt an urge to really look after myself as I was constantly depressed.
I'm not saying I'm doing it right because no sign from STBXH, on the other hand I'm feeling so much better than I should have done that a long time ago.
