Here is a brief guide to what coaching attributes your staff need to gain you a maximum 7 stars in their respective training area.

This is what your coach needs to get 7 stars in:

Strength: 18 Fitness

Aerobic: 18 Fitness

Goalkeeping: 18 Goalkeeping

Tactics: 18 Tactical

Defending: 18 Defending and 18 Tactical
or 19 Defending and 14 Tactical
or 20 Defending and 10 Tactical

Ball Control: 18 Technique and 18 Mental
or 19 Technique and 14 Mental
or 20 Technique and 10 Mental

Attacking: 18 Attacking and 18 Tactical
or 19 Attacking and 14 Tactical
or 20 Attacking and 10 Tactical

Shooting: 18 Technique and 18 Attacking
or 19 Technique and 14 Attacking
or 20 Technique and 10 Attacking

Set Pieces: 17 Technique and 39 (mental+attacking)
or 18 Technique and 36 (mental+attacking)
or 19 Technique and 33 (mental+attacking)
or 20 Technique and 30 (mental+attacking)