Systems Life Cycle (in a nutshell): Analyse - Design - Create - Test - Evaluate.
Designing something or writing out some pseudocode before you actually write code is always a good idea! Get in to the habit of doing so! You can draw your flowchart here and screenshot it.
You may want to read a little about Testing first. A teacher may go through some examples with you. Feel free to fill in the test table here, and screenshot it in to your powerpoint.
Testing is absolutely essential once you have created a program!