Usually the first career is with the club people support in real life. Because while getting used to the game's new features, it makes sense to at least know as much as possible about the team you're managing.
If you're feeling more adventurous, have a look at our Club Insights section for ideas.
Furthermore, shortly after the beta drops, we'll make sure to update our Club Finder area with brand new FM19 data. This is great if you want to set certain criteria for your next club to be.