what should I make for a "kit" to give out to these HR
departments.

Sorry to say, if they're big companies they'll expect a very professional
presentation. There'd be a folder with several pages inside. Most on
letterhead stationery. First, a 1-sheet list of facts (where, address,
web/email, stats on planes, employees, CFI qualifications, list of training
options with or without prices) one with photos and plane specs, one spelling
out the various classes of pilot certification (PP-ASEL, instrument,
commercial, etc) and a few lines on the privileges each has, and at least one
page of ad copy pointing out the popularity of flying and applications like its
use for business commuters, fire spotting, wildlife tracking, traffic
monitoring, emergency travel, charter flights for people and cargo...teach the
reader, who's presumably completely un-informed, just what-all flying a small
plane is Good For. Include both the personal pleasure and accomplishment, and
the commercial/business/public service uses, since you're selling it to people
who are used to considering the bottom line. Send them kind of thing that'll
convince a company to encourage, or allow, employees and execs to take lessons
and perhaps arrange tuition help or a company flying club. What's your goal?