Place bench feet on concrete bricks or stepping stones then level, for added longevity.
If repairing, remove any broken pieces, then recut fresh wood to replace.
Give the bed a good push to address other instability issues.
Flower beds
Position the bench in a desired location in the garden.
Choose taller plants behind the bench, and shorter along the sides. Choose varieties that bloom at different times of the year for an interesting variation.
Arrange the plants as desired, dig holes, enhance soil, then plant each bush or flower. Leave room for expanding beds as you land more plants.
Once all plant placements are established, use a half moon edger to cut pretty flower bed shapes around the plants leaving a nice space between plant and lawn for a clean look.