Advice you can give me about the timing on the motor?

Hello,

In order to get the timing mark right, you will have to remove the timing chain and adjust.
After you remove the chain you will have to adjust the cam and crank shaft timing marks (see diagram).
Pay close attention to the crankshaft sprocket depth while installing.

You might find this article helpful:

https://www.2carpros.com/articles/how-a-timing-belt-works

I have attached the diagrams for your reference.

Please let me know of any questions.

Thank you.