Looking for a updated HTML/CSS to Wordpress convert

Is there a updated guide/tutorial to convert HTML/CSS into a wordpress theme. Also i’m looking for a tutorial on how to display a thumbnail on post.

I’m going to convert this website of mine

You can also download the template via the link.

I’m looking to convert the 3 post below the slider and also below the events. I have zero knowledge at PHP at the moment but i’m willing to learn in order for me to get this job done.