I have never been professionally trained but my first instructor was an oldtimer NRA reps at one of the BSA camps. Perhaps the NRA website is a good place to start. They do have literature there for safe firearm practices.

http://www.nrahq.org/education/guide.asp

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k