Do you have or have you ever seen one of the boxed starter sets? Well I'm not sure about Skull Pass, but in the last edition one there was that little booklet (you can hardly even say that...), about 5 pages... the second half of it were assembly instructions, but the first one had a few little encounters to gradually familiarise yourself with the most basic rules.
You could try doing exactly that, instead of starting with an all out battle at once, take it in tiny steps. Make a few example situations, naturally progressing to more complicated stuff, and then eventually play a short, simple game - for about 400-500 points, with 3 or 4 units - exactly like the armies you get in that boxed set. You can do it in one evening or split it into a few. You can later play more in the same point limit, but using new kinds of units - so that your 'young padawan' learns something new with every game but at the same time consolidate the most important and universal rules.
That's how I do it at least, and so far it works well. Just remember to take it slow and step by step, adjusting the pace to your learner.
Encounters that I usually use:
1. One on one, one side ranged, one side charging (2 turns for running to the opponent)
2. 5-8 models per side, single rank, no CR
3. Unit vs unit - proper CR, breaking, fleeing, pursuing and the like
4. Examples of flanking, rear charges, cutting escape routes
If your padawan catches fast, you can skip to the battle, if not, you can pick stuff like movement, range and all that, separately.
You explain special rules of units on the go during the game, if they're not very essential to the functioning of a unit you can skip them at first and only use them in later games; I also tend to leave magic for later.
Anyway, good luck and I hope I was of some help to you