What are the two ways to start a career in Pro Cyclist mode?

You can create a rider who looks like you, or take control of an existing professional. Choosing an existing rider lets you allocate their initial skill points to suit your preferred playstyle.

How does Detailed Simulation differ from Instant Result in race simulation?

Detailed Simulation uses the full 3D race engine without displaying the visuals, calculating the event in the background in seconds for more consistent, realistic outcomes. Instant Result is the previous system and remains available as a faster alternative.