Custom design for websites

I'm a graphic designer trying to learn web design. I' ve started using Sketch App, and I absolutely love it. However I have a couple of questions for the process. Say, if a client wants a website with E-commerce and a blog in wordpress. The main part of the website is easy, but for the blog part, how do I design for this? Do I design the caregory pages etc or is this somehow generated by itself? For the WooCommerce part do I design the checkout, single product page, shopping cart etc?

Is there any overview or rescources to show me what pages I need to design?

Hope the question makes sense!

Cheers