Watch all the videos for green points, use them in early part of season and then start to save them for the next season. Lower quality players gain faster so it's better to hard train them when their quality is relatively lower in the beginning of the season.

Players don't lose much condition from friendlies, especially if you use low pressing and zonal marking, and if you boost the condition bonus while watching the game. If you watch your friendly match, it's rather easy to control who gets the MOM 4% bonus. Make your wanted player take all the set pieces, direct passing to where he plays. And if an unwanted player has a high rating, sub him off quickly, no matter if it's 1st half or only 15 minutes played, you have unlimited subs in a friendly match so you don't have to spare them.