I think it may be frustrating for new players that begin to understand the depth of the game. Once you start breaking down detailed strategies (round 5-6 timing, etc), things rapidly slide into a morass of explanation of mechanics, timing, capacities, cooperation, etc. etc.
It’s enough for them to begin to understand simply the rules of the game. What does it mean, a unit attacks at one value, defends at another? What is all this sub surprise attack business? Destroyers? Industrial bombing damage? AA gun shots? Naval bombardment? So many rules, so many things to remember. Telling them more than that will confuse them, and confused people become angry. And you wouldn’t like them when they’re angry.
To that end, I think it would be best NOT to go into specific strategies such as Norway offloading, navy benefits for the Germans, and so forth. Yes, have some mock combats, yes, give some vague ideas as to what units are best to build for each power, yes have a mock game for two turns then restart (if they want to!). But NO to anything more than the ABSOLUTE minimum.
The idea is not to convert them overnight into A&A powerhouses. The idea is for everyone involved to have fun, and allowing them to mostly do their own thing, with a very minimal bit of guidance, will be the way for them to do that. They will take their own initiative, and have fun even if they do make awful horrible mistakes like a Russian battleship at the Caucasus.
If this were a training camp, I’d say yes, indoctrinate them from day 1 on what it really takes to kick ass. Fill their minds with rage at their opponents and fear of failure, drum lessons into them by the hour, and whip them when they fail! yes . . . whip them . . .
Anyways!
It’s not a training camp, so let them stumble on their own. Like any proud parent, you might find it difficult to watch them crash into the furniture as they learn to walk, but they have to learn to WALK before they learn to RUN. Trying to train a year-old toddler to run a full marathon is ultimately futile.
BTW, one fun thing you can do for very little expense is have a trophy made. Ribbons, trophies . . . people like things like that. Obviously because you can club the losers to death with them, or shine reflected sunlight in your opponents’ eyes . . .