Contact or access needs to be part of your parenting plan. Children need stability and security at home and school and the plan must be have this contact at its heart.
If you get on well with your ex, a solution that involves the children living in the family home while the parents alternate can work well – at least in the short term. It minimises the amount of moving around the kids do and makes them feel more secure during the most difficult period.
This sort of arrangement might work for you – but it might not. Either way, you should talk to your children about it, because they’ll more secure about the situation if they have a say in the contact arrangements. They’ll be worried that they may lose contact with one of their parents and will be distressed about the conflict - consulting and reassuring them will help a lot.