I wouldn't recommend any power training until you reach about Level 10. You will be playing a lot of inactives over the next few levels, you will win easy leagues and easy champions leagues but you will soon find it boring and a waste of time power training when there is a lack of competition in the lower levels.

Also I wouldn't recommend training players to play in a new position because that effectively costs you just over 3 quality worth of skill points just to add a new position.