I think the notion of educating new people to BDSM is a noble notion, but one that presents more unsolvable problems than it can be possible fathom.
For instance, in the opening post the OP states that we can educate newbies on simple things like the difference between submissives and slaves. However even this one simple concept is fraught with differences in definition amongst life-stylers that results in no clear definition at all. That is unless you subscribe to the pigeon hole idea of a label for roles the majority believes in.
WTF? you might ask. Well some people have one definition for submissive, and a different definition for slave. Yet another person will say that the definition you give for submissive is their definition for slave. So you then enter into a problem of what definition to use, and if you try to give a newbie a definition they should use, you are condemning them to using your rules for their style of BDSM. As we all know BDSM is as individual to each person as are our fingerprints. All have similarities to call them fingerprints, but are all different. The same idea applies to BDSM. We all have our own style, but it is similar enough we can all call it BDSM.
So while the notion of educating newbies is a good idea, you must be able to restrict your enthusiasm for your own style to allow for their growth. Presenting principles to follow, rather than rules and boxes to be put in.
There are things we can educate on that isn't as in flux as definition of sub/slave. Things like flogging, caning, single tails. We can educate new people on what areas to hit and not hit, on what areas are okay to put a needle through, and what ones are not. We can educate on how to electrocute a person without killing them. Anything beyond those basic things are and should be restricted to foundation of ideas and principles, rather than rules.