The best and most cost-efficient way to obtain those 20 Talents is through your 'Youth Academy' building.
Specifically, 20 Talents start to drop from a Level 10 'Youth Academy'. However, from experience, I strongly recommend to only start doing 'Scouts' with a Level 11 'Youth Academy' or higher, as with a Level 10, 20 Talents are very rare. (Took 100 Tokens on one account once! xD)
Big advantage of drivers this way, is the race salary. $312.5k/race usually for the first contract, compared to $800k-$950k/race for trained 20 Talents in the 'Transfers' :)
