Well, everyone's divided into realms, which are basically just the different local groups. Each realm has a different organizational structure ranging from a full squire-to-knight training process to everyone just meeting a fighting once a week. So yes, some realms have organized training. We don't do that so much, opting instead for frequent medium-sized battles (20-30 people).

A lot goes into spear fighting, though. I'm mainly a spear fighter myself, so I could talk about this all day, but I'll keep it brief. The technique changes depending on whether you're alone, on a shield line, or in a small group. It also depends on what you're facing and whether there are other spears around.

For instance, fighting one-on-one, I'll use a spear with a dagger in my main hand as well. I'll basically just kite, always keeping it pointed at them even if I turn and run. You can do some interesting jump-spins that let you keep momentum while turning for a stab. If they catch up, I'll drop the spear from my right hand and use it to pin down their sword arm with my left while basically hugging them and backstabbing with the dagger. That's against a shield, at least. It's entirely different against another spear, a florentiner, or a two-handed weapon.

On a shield line, one of the most popular things involves two spears some distance apart. They'll find an enemy shield between them. First, one spear stabs hard against the near edge of the shield, forcing that side back. Immediately after that, the other spear comes in behind the other side of the shield for the kill. This works even better if it's a punch shield instead of one that straps onto your arm because there's really nothing preventing it from rotating.

So yea, those are just two very specific examples of things you need to know. There are a million different tricks like this, besides basic kinematics and footwork, that you need to know to use any weapon set well.