Welcome to the forum

Companies vary but as a rule of thumb, create yourself a leader, a sidekick/sub-leader and a third character who is a specialist (engineer/medic/duellist etc). Then create yourself the poor infantry that follows them into battle. Again, two or three types will usually do and statting them is easy, just look at the lists in the book for examples. If they are well trained infantry look at the British Rifles, skilled toughs look at Lord Curr, for rabble look at the Tong Boxers. Choose any relevant skills and equipment but don't improve their pluck ratings.
Also, as an example, if you have a force of trained infantry and want to have an elite version, you don't always need to give them better stats. You can show their elite status by giving them skills, Marksman and Fearless would be good examples.
That's my suggestions for starting off anyway

What kind of list are you looking to do? I'm sure the guys here will offer you some suggestions.