Simplified solution: Buy 18,19 yo players they will last you until they are 23,24 in the first team. Once you create a decent starting eleven you can skip the Transfer market for a season if you want or continue to sign 1 or 2 players each season and so a balance is created.
2. Tank once every 3 or 4 seasons for resources.
3. You can't expect to win everytime and everything, this is not a single player game, somewhere in the world somebody better than you exists, just enjoy the ride.