Focus on OD by training pressure, but you should do some one on one training to keep his handling at the same level. If you only train OD, it gets slowed down because of the elastic effect.
If you train an SF, you can train all skills. Best thing is to train pretty balanced because they use all skills and that way he is most salary efficient. You can adjust training for the offense/defense you want to run; I like my SF with high OD so I can run 3-2 zone. Then add some more IS for inside attacks or JR for outside attacks. Passing should end up above 9.