Hello. As I consider myself as a experienced guy, and was an officer in few regiments, also col, I think I might give you few decent advices.
1. Choose the fuckin best name. THIS IS YOUR BUSINESS CARD. First thing, potential cadet see is your name. Do not seek for never used one, or even worse don't even try to seek for some "interesting, unknown regiment". Name should be glorious!
92nd name is great because of Waterloo movie. That scene
made this name better than 42nd. Despite fact that 42nd and 3rdFG were a bit better regiments, imao.
It's easier to recruit when you're 2nd Coldstream than 2nd Zulu infantry. That should be so obvious, but it's not. That's why some too much creative people all the time seek for some regiments I never heard about them. Cuz then my reaction is like : https://youtu.be/tbrETiALUIQ?t=48s
2. Merits. Good NCO is recruiting NCO. If you're Colonel, you should asap introduce merits system. 100 merits = lvl up. One invited guy= 20 points. Don't worry about amount of Cpls. You'll still have much more rankers.
3. Videos. Recruiting on the servers. Etc... It might help. But if your regiment will be fuckin 0, and your only goal would to be command, train formations and get rekt, so you should asap disband it, and do not waste time of some people anymore. Aim high! Discipline is vital, and winning is sense of this game.
Create great teamspeak 3 community, and great team in game. Regiment where everyone would like to be. Then, recruits will come to you.
4. If your regiment is shit... Disband it, do not ask some guys to join it cuz you'll waste their time. Pro tip.