I think NewAgeOncome is talking about some site-creation software like Dreamweaver. For Mac you have iWeb, it's part of iLife and you can design easily a website; the problem is that you can only publish to a Mobileme account which costs $99 a year.
I recommend to use Coda and TextMate, but they're text editors, so if you're newbie, you won't find them very usefull. Definitely the best software for Mac (free) is N–View, it's like Dreamweaver for Macs and Linux, it's free and you can get if from (
NVU)
Hope it helps