Building a strong base NOW is one of the best things that you can do to help ensure a more successful season LATER.
Each event (sprints, jumps, distance and throws) has different pre-season goals.
Use the below links for distance and sprint/jump plans. Follow these plans or create your own, but stay consistent with your workouts for best results.
Below are some additional workout that I find challenging but easy to do at home. You can use these in place of any workouts linked in the plans above and are good for all event athletes.
Total Body
Core
Upper Body - arms and back
Lower - legs and glutes