Before we get going on organising activities, it is important that you are comfortable with MindManager. It's difficult to learn two new things at the same time.
MindManager is a very powerful tool, but like most sophisticated software, you don't need to know all of it to use it effectively.
If you are new to MindManager, then take few moments to work through the MindManager Essentials section in Appendix B. You might find it useful to print it out and make your own notes on it.