I downloaded a free agent database on FM where every player is a free agent. Started with United then took over Lille in December as they only signed 7 33 year olds, Geubbels and Lunin. Built a pretty fun team:
Augustin/Dimata/Mayoral
Balde--------------------Paqueta
Tielemans Fofana
Gonalons
Junior Tavares Gnagnon Engels Rosales
Lloris
I'm retraining Paqueta as the formation is working well. Also signed Nkunku, Gouiri, I.Konate, Blas, Skhiri, Roux, Rodrigo Ely, Soumaoro, Mazan and Krafth. Currently 2nd in the 18/19 season.
Also took over Bilbao to help fill out their squad. It's fun building teams but the AI isn't great. 4-5 teams in each league only sign about 5 players and a lot of players go unsigned. Messi went to China. Ronaldo was unsigned for a couple of months until I signed him for United on £120k a week.