During the first week, we give simple lessons at circle time including how to carefully carry a glass plate with food to a table from the snack shelf. Next, we give lessons on carrying a glass of water from the snack shelf to the table. We show the kids where to place their plates, napkins, and glasses on their table mats. After lessons have been given, we give the children the opportunity to begin the process of helping themselves. It may be necessary to serve their snacks to them for the first week as you are getting to know the abilities of your age group.
Once the kids have had some lessons, a teacher prepares snacks on glass plates placed on a shelf that is several feet to several yards away from the tables that they will be eating at. After our morning circle time, the kids are excused one by one to find a set at the tables. Once all of our students are seated at their tables, we all sing "thanks for food," and then children are excused two at a time to walk up to the snack shelf and carefully carry their plates to their table. Of course, we have demonstrated how to carefully carry the plates to their tables prior to asking them to do so, as well as how to push their chairs under the table and so forth. Once these children return to their seat with their plates, they carefully place their plates on a table mat. Before sitting down, they may return to the snack shelf to take a glass of water. The water is already poured into the glasses for them and they have previously had lessons on carrying glasses filled with water. Once they carefully bring their water to the table and place it in the appropriate spot on their table mat (which is yet another lesson that they would have prior to helping themselves to the snack shelf), then they sit down and enjoy their snack. Lessons on pouring are also given with small pitchers so that each child may pour more water for themselves if they want more.
This is just one approach to introducing snack time to youngsters. In our primary class, the kids learn quickly to serve themselves completely.
I hope this helps. Enjoy your snack!