Is there a guide on training new positions or special abilities?

Suppose if you are training your MC a new position. There are 2 points to consider :

1) Choose the drill which has no attributes which belongs to Goal Keeper. If the drill has agility or concentration attribute then condition loss due to these 2 attributes will result in no gain as MC doesn't have these 2 attributes.

2) Observe your player and see which attributes of your player is the lowest. Then choose a drill which trains those low level attributes. This way you will get better gains because the higher your attributes the lower your players gains from drills.

My most favourite drills are :

Press the Play in defensive section : For Mid Fielders, Attacking Mid Fielders and Strikers.

Slalom Dribble in Attacking section : For DMC, DC, DL and DR.

Try training your squad in groups for a season. GKs /st , def, mf. It works.