From what I can gather from various sources, the trick is to play humans as a bashy team against weaker opponents and as a finesse team against tougher opponents.
For some reason, I can get my head round the offence side of the game much better. Smashing my way down the field, slipping runners through gaps and threading passes down field are all easily understood concepts. Maybe not so easy to put into practice, but at least I know what I'm trying to do on offence.

However, on defence I'm less sure of my tactics. Obviously the aim is to prevent the opposing team from scoring and regain the ball. In my last game against an Orc team, I played with a long wide scrimmage line (about 6-8 players) with the remainder 2-3 squares behind. However, this seemed to result in a rather one-sided brawl and his runner eventually slipped through a gap to score.
I guess the alternative is to set-up my defence further back from the scrimmage line and let him come to me. Presumably I'd be looking to try and slip some blitzers around his front line and sack the ball carrier. It seems rather counter intuitive to give up yards like that and I'm not sure how I'd avoid a repeat of the LOS beating further into my own half.

Any advice for an amateur coach?
If it makes any difference my team is 5xlineman, 2xBlitzer, 2xCatcher & 2xThrower. I know that 4 Blitzers would be much more useful but I'm limited to the plastic figures from the 3rd edition box at the moment. Hunting down some additional figures is high on my list of priorities.