Training players for new positions is very hit or miss, mostly miss. Check their "Positions" screen and see if the position you want them to learn is listed at all. If it says "unconvincing" or something along those lines then you may be able to have them learn it. My only advice with the team talks is to never use the "play like this every week" comment. It only gets players unsettled, usually saying that you dont give the team enough credit. And one more young Scottish player, aside from the ones I mentioned before, that I highly recommend if you can get him off Celtic is Shaun Maloney. I had a rash of injuries in my Celtic game so I played him for 5 games and he scored 13 goals