Google Drive

Once in your account:
Click the word "Drive" at the very top of the page.
Click the red word "Create" on the left side of the page.
When the drop down menu opens click the type of project you would like to work on, such as "Presentation" for a PowerPoint presentation, "Document" for a Word document, etc.
At the top of the page, click "Untitled Presentation" and type in a relevant title.

How to share (if your teacher wants you to share your work with him/her or to share your work with group members):
Click "File" then Share" (top left)
Type your teacher's email address at the bottom of the pop up where it says "Add People."
Use the dropdown menu on the right and choose "Can comment."
Click "Share & Save."
Click "Done."

NOTE: GoogleDocs automatically saves your work. You can come back to your project anytime you're on the internet, from any computer. No flash drive is needed.

Other online tutorials can be viewed here