I assume you want to train him as a Guard since he has a good height for that. Firstly, you should get yourself a second trainee. Someone similar to Radomir (small/young). Now that you have two trainees for guard training it is most likely to play them at PG and train one position training skills (OD/PA/HA and JR for SG). Let these skills increase equally and you'll have two nice players after one or two seasons. Afterwards you can add a few more trainees to make two position training at guards for JS/DR.
This is the way I did it and one opportunity you have now.