You must train them in all the skills useful for G, P and SF, their ID can't allow you to create good SF so you need to think about how to sell them in the most profitable way or at least to give you more benefits on the field. IS is something I love when I've to buy a player but I will never buy a player with IS 10 and ID 1. Good luck!
1990-2022 Stalinorgel - https://www.youtube.com/watch?v=pV-Xppl6h8Et