One of the best things my parents did for me after separating was make our holiday celebrations predictable.
Christmas Eve and Christmas Day were with my mom. New Year's Eve and New Year's Day were with my dad. I knew what to expect, and I had rituals with both sides of my family.
They also divided the gift-giving celebrations: Santa with my mom, Reyes Magos with my dad. I grew up in Spain, where Three Kings Day gave us another occasion to celebrate. That particular arrangement won't fit most US families. But what it gave me can: something familiar to look forward to in each home, and time to enjoy being there.
That's where I would start a holiday parenting plan. Imagine the day your child will actually have. Will they get to play with the presents they've just opened? Finish a meal with their cousins? Stay for the tradition they look forward to? Or will they spend the day watching the clock because they have to leave again?
You may be reading this before you've discussed holidays with the other parent, or because someone has handed you a proposal and you aren't sure what to think. Start by working out what you want your child to experience, which arrangements could support that, and where you need more information. You don't need every answer yet.