How can I add custom icons? or - custom font code error?

Hey all, I've added a custom font in my assets for use in the headers. However, the font code doesn't work unless I remove the Turbo ttf and woff files. 

Of course, doing this caused the icons to break - I guess the icons are attached to the turbo fonts. 

How can I add custom icons to replace the broken icons?

or... 

My custom font code is: 

@font-face {
font-family: 'hurston';
src: url('HURSTON-TYPE.woff') format('truetype');
font-weight: normal;
font-style: normal; }

.caption .headline { font-family: 'hurston' !important; }
h2, .h2, h2.title { font-family: 'hurston' !important; }

@font-face {
font-family: 'young';
src: url('Young.ttf') format('truetype');
font-weight: normal;
font-style: normal; }

p { font-family: 'young' !important; }

and my files are:

•  HURSTON_TYPE.ttf
•  Young.ttf
•  HURSTON-TYPE.woff