Minor Shopify edits needed

I need support with making a few minor changes to my shopify .CSS and overall site.
This may be on-going as small things will come up.

Some changes I need right now for example are :
Removing the SKU & available box from products page (See photo)
Removing the Vertical menu (see photo)
Removing the ' items' number appearing under products on the main page (see photo)
Optimizing the mobile logo