Your word processor can create letterhead. Just use a different font. O Business style format. Let your modern word processor help you here. O Laser printed if at all possible.
Ink jet is okay.
NOT a 9-pin dot matrix printer. Sweet talk your boss into printing it for you on the company laser. O No more than one page for the cover letter. O Absolutely nothing negative or amateurish in the letter. O Sell, Market, and Sell.