In the original campaign there is a mission which attempts to do a little of that, but it's not very helpful as I recall. I don't know of such a misson and it would be a good idea.
However, in OFP group leading is very personal. There is rarely a "right" way and a "wrong" way. Also, you rarely have time for close control of your group. Having all your men slaughtered while you have no idea what's going on happens to me quite often, I wouldn't worry about it.
Splitting your squad into fire teams (red, green, blue etc) can be very useful. If you do split into two fire team you would normally (as infantry) place the other team something like 100m away from you and attacking the same point from a different angle.
Few personal tips
- There's no doubt at all that Wedge is the best general, all round formation. I use Line sometimes for attacks, and occasionally Echelon if the nature of the ground/axis of attack dictates it. Column is only for getting loons through narrow spaces. Vee is for "reconnaissance by getting your loons shot."
- I use Hold fire quite a lot, particularly when approaching enemy positions (or when they are approaching you). If you can launch and ambush or surprise attack at 100m or less, you have a good chance of wiping most of the enemy out before they know what's hit them.
- The default position is prone. If you are standing up you are running. If you are standing still you are dead. There are obviously some exceptions, for example when you know it is safe. The AI is very sensitive to movement, particularly by standing loons.
- I issue Return to Formation commands quite frequently to stop loons from getting lost
- As group leader there are quite a lot of commands available to you. You should at least know what they all do, even if you don't actually use all of them.
An effective position for a loon is lying in a bush with a good field of fire.
You should expect an ambush round every single corner. Usually there isn't one of course, but if you always assume that there is then you never get ambushed. ;D
Towns are deadly. I rarely enter a town unless I've covered two sides of it from outside, that way you have at least temporarily cleared the open ended streets. Once you're in, keep your head turning.
I started to write this as a kind of a plan for how a training mission might turn out, but there is just sooo much to cover. Training campaign more like it.