Training players is very fun and your player has amazing potential and decent starting skills. With that being said, you will
Want to have a decent training setup if you are planning on training him.
I would recommend bare minimum to have a level 4 trainer and a level 4 youth trainer. The higher the better, but a 4/4 setup usually gets the job done. Managers typically start out training 1v1 F for players so that would be my initial suggestion.
The other option would be to sell him, which you could get nice value for. I imagine based on his skills, potential, and height, he could easily sell for $1,000,000 or higher. If you elect to sell, you could easily pick up a few cheaper but still solid trainees and then have a lot of extra money to work with to expand your arena and build your roster.
Not a right or wrong way to go about it, just a preference thing on what you think would be more beneficial/fun for you!