It is incredibly rare for one parent to have all the custody, so I think you are wise to accept that he will be sharing time with you.
My state has a standard visitation schedule where one parent has primary custody and the other has 1st, 3rd and 5th weekends with a possible overnight during the week, but at a minimum, a mid-week dinner date (Wednesday 6 to 8) or similar.
Holidays alternate by year and school breaks (like Christmas) are split between the parents.
You might do a google search on "standard child possession schedule" in your state. There is almost certainly a statutory custody arrangement and the courts often fall back on this when the parties don't agree.
(which with your narcissistic XH will likely be the scenario. I have one of those too.)