Hi Micheal
Firstly add the Google font code just before the </head> tag in your templates index.php (../templates/j51_revelation/index.php). The Google code will look something like the following...
<link href='http://fonts.googleapis.com/css?family=Acme' rel='stylesheet' type='text/css'>
You can then add your CSS to style elements with your font in the end of your templates template.css (../templates/j51_revelation/css/template.css)..
eg..
body {font-family: 'Acme', sans-serif;}
Ciarán