Thanks for taking the time to reach out for some help! The following link really serves as a wonderful guide for effective Time-Outs. Remember, it is very important to be firm and consistent when administering a Time-Out. While the child may throw an outburst in response to getting put in Time-Out please remember how important it is that you don't give in.
Time out for daycare/preschool age should be sitting out away from group and should last no longer than 5 minutes. The teacher should also explain to the child why they are in time out and what the consequences will be if the rule is broken again. Ask the child what they were doing wrong, what rule they were breaking, and what they should've done instead to make a better choice. To begin with classroom rules and consequences should be discussed with the children when they first come in to prevent needing a time-out. Time outs can also be used for the child to take a break. If the child has any kind of disabilities that relate to anger they may need to take a time-out from the group or activities to cool down.