Editing WordPress HTML doc

I am new to wordpress and I am trying to edit how the blog posts are showing up in my template and where they are linking to when you hit read more. Right now when you hit the read more button the user is still on the homepage, I want them to link to separate page that houses all of the blog posts. In addition I want to add some additional things which I can’t do in the CSS I have to add it to the HTML for that page. I have seen some posts in the past asking about this, but I am not seeing any solutions. Please help. Thanks!!