@Ahmed You're welcome
Nordgen = young, expensive, fast growing player.
Age: 18-20. Average growth: ~5% of skill progress per 1% condition lost. That means when you put player like this on training, with normal intensity he should earn about 45% of skill progress if he loses 9% condition. Hard intensity spends around 2X more condition, but gives 2x more skill progress and higher possibility of getting your player injured. Skill progress per condition rate is always same for certan player. So if you use your player in match or training, he will always have same growth until his quallity changes. Higher quallity players grow slower as well as older players.

My main team is currently on level 14, so I can tell you that best nordgens for your level are:
Quallity 80-84, worth more than 40M

Last season when I was Level 13 as you are now, I have bought Q84 young player for 35M, but he is not nordgen, so nordgens are quite expensive.