If you want to use any font in your website you can use this:
@font-face {
font-family: 'Helvetica Neue';
src: url('Helvetica-Neue-webfont.eot');
src: url('Helvetica-Neue-webfont.eot?#iefix') format('embedded-opentype'),
url('Helvetica-Neue-webfont.woff') format('woff'),
url('Helvetica-Neue-webfont.ttf') format('truetype'),
url('Helvetica-Neue-webfont.svg#Helvetica Neue') format('svg');
}
To use any paid fonts, you should buy the font and put it in your folder. Use this site to create all types of formats: http://www.fontsquirrel.com/