How does last mile delivery work with a Shopify store?

[HCGT]

Hello, 

Please accept warm greetings! 

Please I would like some clarifications on the below points;

1, Running a Store with Shopify who performs the Last Mile Delivery?
2, Is the a team available for the listing or it should be done from my end?

3, What are Shopify's commission? 

Thanks in anticipation and best regards.