Always be polite and respectful to your members. In the real army a man can stand in ranks and receive shit for messing something up. Do the same in a video game the guy will leave to find a group that wont be rude to him.
What I did and is my opinion that most new regs should not do is DONT START AS LINE INFANTRY. Unless you are starting out fielding like 20 guys its not worth it. Line requires strict discipline and training which is hard to do but has great rewards. I would start as a skirmisher. They are very easy to command (good practice), its very easy to do as long as your guys are good shots, skirmishing is super chill in events because you can just sit back and watch the score rack up and most iimportantly you can be effective without having to field large numbers.. Plus its a good recruitment incentive.
But then comes that oh so fun time when you need to make a transition to line, and some people who joined a skirmisher regiment may not be cool with that.
Lines have never required strict dicipline, all it takes is some common knowledge and knowledge of how to play warband, lines battles and lines are dictated by Melee, if you don't have good melee players then any size of line infantry can beat it.
Skirmshing also does not require good shots it actually requires good tactical knowledge on when to reatreat and how to retreat and that is where skirmishers win or lose. A skirmishing group is great for point blanking and retreating in a slow fallback keeping some men behind to reload while the front retreat after killing the closest enemy, you can win entire battles like that. 52nd used to do it on the American servers and wiped out entire lines with about 1-2 men losses ... 20 against 1-2 is a great victory and then take on another line.
Strategy and good player instict is what makes a good line. Strategy holds a skirmishing regiment together.
Brains and Skills ... not training.
