Electrophilic addition of propene with chlorine?

Hello everyone,
Tomorrow we have a chemistry test on electrophilic addition.
Our teacher gave us exercises to do.
…unfortunately, I’m already failing at these.
Could someone help me solve this?
The task is as follows:

B: Electrophilic addition:

Sketch the electrophilic addition of propene with chlorine in all its steps. Describe the mechanism, noting the important steps. Draw the movement and "attacks" of the electrons.

Additional questions to B: Explain why two different by-products can be formed in electrophilic addition and why one is clearly preferred (Markovnikov rule).

I am grateful for any help!