My clients want Sub-Domains but i am not sure how to do this, can anyone offer some help or a site to visit where i might get some help?

you set up a sub domain the same as you do a normal domain. Make sure you untick the box "www"

Do i need to add another Domain name in. Like yourhosting.com would be the first entry and a new one would be faq.yourhosting.com ?? or can i do it all from yourhosting.com

This must be set up as a new domain.,

Therefore click on "New Domain" and then enter in somesubname.domain.com and away you go.

Again make sure you untick the "www" box when adding sub domains.