You sound like my husband.  He is already preparing for when our daughter starts dating (she's only 5 now).  However, he has had lots of practice terrorizing boys who wanted to date his "baby" sister.  He might have some pointers if you want them

My father used to scatter rifle and shooting magazines around the house.  He really is in to guns (he used to hunt a lot) and had a target practice area on his 17 acres.  So, he left his reloading stuff out a lot, too.  I once got a comment from a friend who lived in Detroit (we lived in Northern Michigan in the country) of: "those guys downstate have the guns, but I'm scared to death of these country boys who know how to aim"....couldn't stop laughing about that for days...