Do I fill the Possession of and Access to the Child/ren (Visitation) form if my spouse and I don't want the court to make a schedule?

The first paragraph of the possession order says that the parents can have possession of the child[ren] at all times that they mutually agree.   Accordingly, the parents can follow whatever possession schedule they want.   That said, the Court will require you to have some sort of "standard" possession schedule that you will follow in the event the two of you cannot agree.  Or, you could type of your agreed schedule and ask the judge to approve that.  Regardless, the judge will have to conclude that whatever is in the order is in the best interest of the child[ren], unless the schedule is one agreed to in mediation.