To disable open state of the first accordion ;

Deleting these lines (8-9) of the accordion.js file in js folder

$('.accordion-header').first().toggleClass('active-header').toggleClass('inactive-header');
$('.accordion-content').first().slideDown().toggleClass('open-content');

Fonts;

Title fonts are inherit with the web theme you are using. To change them you need to modify the h2 in the theme you are using