...To continue scratching the surface, I'd add as being beneficial:
- build a larger arena than what you have at the beginning (optimal arena size has been discussed in many posts, but DO NOT do what I did if you want to save money, in terms of building an arena or, well, roster as well... but the arena needs to be big to accommodate all my players, and those that do not fit 12 player roster will be spectators, so it's a win-win, right? xD)
- acquire some cash after you've got good enough personnel, arena built as large enough, and gym(and possibly other stuff bought) as that would allow you to play in lower divisions for extended time (if need to get good drafting picks arises/becomes acute)
- if league success is critical (sometimes it could be so critical that you're going to have to sell your biggest stars if relegation would otherwise cause your team to go bankrupt in the following season) in addition to training, maximize success in league with little things - optimize who you train against which opponent and at which position, be open to the idea of changing your training positions(/training) from week to week if it suits your bigger picture (sometimes it causes your team less "damage" in terms of success in a single match if you play a trainee in 1 position instead of 2) to make you more competitive and harder to read tactic wise, hire a PR personnel with special skill (any of the two skills that you prefer) etc.
- as far as personnel goes, some managers think youth coaches are very beneficial - but they need to be high enough level to be beneficial
- as for drafting points used each season, it might be wise to be flexible and optimize which seasons's you´re going "all in"
As for planning training, several different considerations would need to be made, for instance:
* how much current age and length of player affects training speed (approximated tables of how much each of these affect training speeds have been sent to forums in the past, I have found those tables very useful)
* how much personnel level (regular and possibly youth coach) affects your training results
* in which state is your team now (and does it need to be successful now in terms of winning?), or in 5 or in 10 seasons from now? Can you train 2 or 3 positions in a match and simultaneously be successful, or possibly only 1? It depend on so many things, but in general I wouldn't recommend 5 player training (15 players trained weekly), the gain per player is just too weak and it's way more important to have 6 well trained players (2 position training) than 15 so-so players (5 position training). Training speed table (mentioned before) is useful here
* remember elastic effect in training to optimize training effectiveness
* keep in mind which secondary skills each main training type develops (for instance if you train OD, it gives training to ID and something other)
* Do you have some current or future NT players in your roster that you want to/need to give training priority to (and how will it affect your other team in the following seasons - are you able to combine training that NT player needs with the needs of your own team?)
I've trained couple of players for NT (not all that many considering my long BB history), and while it's one of the greatest achievements you can have in BB to have your player play in a NT in an important role, as a homegrown team there might be challenges to combine those both aspects at least partly optimally. (Also consider that if you train player for adults NT, then your player wage will likely skyrocket through the roof at their prime so be ready for that economically, or in the worst case you could be forced to sell the brightest star of your franchise to avoid bankruptcy).
So here it was, a 8000ish character scratch about the topic in total.. ;D I'm sure I forgot many things, and other would need to be discussed in even greater length and/or given links to forum posts to be completely useful...