You can send all of your documents using Google Drive.
You should make a folder in Drive to hold all of your documents. Clicking the little folder next to the name of a file, allows you to save a file in to a folder.
Edit your cover Letter
Be sure you have the correct links to your resume and have changed share settings to "anyone with the link can view".
Copy and Paste the cover letter in to an email.
Be sure that you have a subject line.
Send
All of the resources are on the website. If you would like to edit any of these documents in any way, you will need to:
Open the document you wish to edit
Make a copy of the document
Rename the document with a title that includes your name as well as the document title
Edit as needed to suit your needs
To send a document to a site supervisor:
1) Google Docs: You can send all of your documents using Google Drive.
Resource: Share a Google Doc with a Non-Google User
2) PDF Documents:
File > Download as a PDF Document (.pdf) document
Attach the .pdf document to the e-mail (be sure that you keep .pdf on the end of the file)
These documents cannot be edited