Oria Theme customization and hiding posts.

Hi There,
I apologize if this topic has been covered already. I am using the Oria theme and my first foray into WordPress/website design, but have a couple question on the them;

1) As I’m using the site site primarily as conduit for portfolio/past design work, can I hide or shrink the blog posts component temporarily until I have content uploaded?

2)The Customization of themes allows for a bit of tweaking in terms of the header and associated fonts, for further customization I will need edit the CSS file or is there a plug-in/add-on they expands on the customization within the interface?

I would essentially like to understand the out-of-the box limitations on customization for the theme or is it Sky’s the limit as they say..

A clean, minimal and modern theme way.

Thanks in Advance!