In terms of the overall agenda (e.g. doing MK Day 1, EP Day 2, etc.), there is no built-in way to share that. What people generally do is make a post with their park plans for review by the Forum community.
As previous posters have mentioned, you can share your TP for a given park/day by making it “Public” in the settings and sharing the plan URL that it gives you. However, there is no library of “Public” plans that you can browse through - for that you should look to the ready-made plans that TP has on-line and in the book. There is a wide variety of plans to suit different age groups, agendas, and touring styles.
In terms of how to set up plans, a good starting point is to take one of the ready-made plans and make a copy of it so it becomes a Personalized plan. You can then modify it to suit your needs and Optimize/Evaluate it for your specific days. You can also use it to help decide on FPP selections - see this post for my methodology for doing this:
Finally, all this planning can be overwhelming at times - here is my post on how organize your planning efforts to minimize the stress: