From separation experience. As a parent and as a child.
The first 6 months will be the hardest. Your children's behaviours WILL change. Their life and everything they have know has been flipped upside down, don't feel guilty, it's for the best and they will adjust over time and behaviours will improve.
The important thing is routine routine routine! While I am an advocate for spending as much time with each parent, believe me it won't work and when they are both at school it's not viable. Set the access/custody arrangements for the future now for less disturbance later on.

My son sees his father every second weekend, set in stone (with flexibility if we have events etc). Then if either of us have something on (such as a suit fitting for their wedding next week) we are flexible with that. But the change in our son with this routine compared to the previous arrangement is phenomenal. 70+% of court arrangements end up being primary carer has custody, secondary carer gets every second weekend. I advocate for that arrangement. It works, I have experienced it as the child myself (that's what my parents court ordered arrangement was) and I witness it working every day with my son. Thankfully myself, my husband, my sins father and his wife all get along (after a lot of hard work!) very well and we see what it does for our child. I only wish everyone could be so lucky.

Good luck!