A 12 week plan to include basic speed, endurance and open water drills.
The format of the sessions is as follows:

Week 1 = test week. Its for you to know and understand your current level, and know what speed you should be performing some of the intervals at.

Then the focus is on the following:

Weeks 2 - 6: Session 1 = basic drills; Session 2 = CSS swim speed development
Weeks 7 - 11: Session 1 = endurance development; Session 2 = Open water specific drills
Week 12 - Retest week

Some of the drills may require you to use a kick board, pull buoy and some hand paddles

Perhaps have a look at whats in the plan, and see if you understand the structure of the sessions. It might be worth printing out the sessions and putting them in a zip lock, along with an explanation of the drills, which will be attached in some of the workouts.