If you are using mustard or caraway seeds, or both, pour those in (1/2 teaspoon of each) with the peppercorns. Add a bay leaf as you fill in the middle of the jar with spears of your cucumber.
Place the cucumber spears in the jar with the cut side facing out. Go around the outside of the jar and then fill in the middle. Push garlic between a spear and the glass in a couple places. Push the rest of the garlic into the middle.
Add fresh dill between the glass and the cucumber, and more in the middle area. You will use about 3 sprigs of fresh dill.
If you are packing rounds, add your spices and the bay leaf to the jar and then line the jar with fresh dill. Layer your cucumber rounds with the garlic. You want your jar to be attractive on the shelf, not just delicious.