In my opinion it's not very useful to train certain roles. If you train for example a striker on "Complete Forward" or a midfielder on "Box to Box" then you will train a lot of attributes. The more attributes you train, the slower they will develop. Your coaches can only give limited time to each player, so a player who trains on a few (say 5 or 6) attributes will increase much faster on those attributes than a player who trains a lot of attributes (say 12+).I do individual training by position that will play.
Goalkeeper: Sweeper Keeper
Defendef Left: Wing Back
Defender Right: Complete Wing Back
Defender Centre: Central Defender
Defensive Midfielder: Ball Winning Midfielder
Midfielder Centre: Central Midfielder
Attacking Midfielder Centre: Advanced Playmaker
Attacking Midfielder Centre (Left/Right): Shadow Striker
Teams Talks Tylerbode
Kick-off: 'Nothing'.
Half-time: Winning: Calm 'playing well, but there is more to come'. Drawing or Losing: Aggresive 'far from pleased/show me something else?.
Full-time: Won: Calm 'well done, I'm pleased, good win for us'. Draw or Lost: Assertive 'far from pleased/we should have won?.
Therefore i think the following roles are the best ones to train looking at the importance for the position and the speed at which they will increase:
GK: Goalkeeper
DRL-WBRL: Full Back
CD: Limited Defender
DM: Half-Back
CM: Deep Lying Playmaker
MRL-AMRL: Wide midfielder
AMC: Advanced Playmaker
ST: Deep Lying Forward
With this training schedule, you basically train your players on the most necessary attributes for their positions. Personally I use "Tactics" training as team training, because it will increase the mental attributes more than any other team training.
So by using above player training in combination with "Tactics" team training, you’ll make sure your players will improve in every area.
Note: If you are a lower league team, I would advise to put team training on "Fitness" because that will benefit your players more.