Data Analysis question2 need to be answered

You are a Microsoft Office trainer for DeVry University. The training topic for the current month is charts using Microsoft Excel. During each training session from different departments or cohorts, the following frequently asked questions were asked and you decide to create a document formalizing answers and suggestions.

1. My supervisor, Sally, likes my charts; however, she instructs me to take more time planning my charts before creating the actual chart itself. Why is planning the creation and development of a chart so important?
2. My supervisor, John, ask me to chart some comparative data but my first attempt with a column chart did not illustrate the data as well as he would have liked. What type of chart is ideal and best to illustrate comparative data of individual items in a data series and why?
3. My supervisor, Jessica, asked me to project future data trends using a chart. Most of the data is associated with sales and depending on the nature of what is sold, data either fluctuates or increases quickly. What chart feature added to a column chart can help project these data trends and why?
4. My supervisor, Thomas, asked me to add some creativity with color and enhancements on all charts used during weekly meetings. What should I consider to avoid being overly creative and why is this important?