Here’s a tutorial I found for the logo – https://wpsites.net/web-design/add-logo-image-next-to-title-in-studiopress-themes
If that’s too difficult, I’d probably just upload a logo with the image and the text already in it so you won’t have to handle any code.
It looks like you’ve already added the code for your site title –
#title {
font-family: "Comfortaa",sans-serif;
font-size: 32px;
font-weight: 300;
line-height: 42px;
margin: 0;
}