ORIGINAL: farm hunter
Kevin is right - Start Small.
While it is noble to want to do better - Set some realistic goals for the property. First - set up a Comprehensive data collection for your property. Maybe its # deer/bucks seen per hour on stand, or weight of harvested deer. Set a couple goals - and keep good records - you will find that your hunters will be happy to record their observations. - You may even discover something new about your property. Once people are more involved - it becomes MUCH easier to change preconceived notions regarding deer hunting and management. It will take several years - in the meantime - enjoy hunting with your freinds and family - and coax it along - you never know - the State might institute Antler Restrictions or something (not too far fetched) - and you'll be ready, as a group to deal with it.
FH
Document the deer sightingsas young bucks, mature bucks, and does (add buttons if it can be done). There's a plethora of info in that when using time, and other factors.
Another quick thing, especially if you can talk them into it...create a small sanctuary. Maybe 15 acres could be set off-limits to anyone, unless they shoot a deer and it runs in there (which case you would only go in under cover of night). If you could pair that up with a few 1/4-1/2 acre plots on your property, you should be proud.
Teaching them to pass young bucks right now sounds illogical, because they won't buy it. What the sanctuary and plots will do is bring in more deer (and more bucks). That means hunter sightings on standwill increase, and slowly the guys will become less and less interested in the smaller, younger bucks. It is a dreadfully slow process, but after a year or two of good management, I'd bet the guys will be quietly passing yearlings.
It's going to be hard to get the guys to buy into it. However, that state land will cause a trespassing problem if your plan gets in gear.