[all of this is my advice, based on my experiences.. it's by no means truth!]
Labels aren't 100% sold on the amount of friends, listens and views.. but it does mean that you're promoting yourself (less work for the label) and that you've got an audience (who will pay money for your product) so it does help A LOT when you're putting your stuff around the web - and consistently putting yourselves in a position of attention.
If you think a website is something that would work for you, then yes.
This is YOUR product - so I can't help you sell it, but if you think about it - a central point of your facebook / bebo / myspace pages can be a website.
So, if you have the money and time - set up a good one. Update it, and include pictures of your fans wearing your t-shirts and at gigs.
It shows again that you have fans who pay money for your product. [this can all be applied to the myspace]
If you've got a DVD - cut it up, and put it up on youtube.**
I did similar for a band I've worked with (myspace.com/centuriescryuk)
Youtube Link;
Note the number of views on some of the videos,.. and that's myspace pimping only.
If you create a multimedia disk (EPK again) then include your BEST song in video form. The one which is a label-winner. The first track on the CD? yeah, that one!
Basically, if they like your apperence / sound / attitude they'll want to see you live.. but if you can show them evidence of you live - then that gives you a boost over other bands. You've given them all the information they need, and you may interest them enough to come and see you play.
Also, i forgot.
A massive, massive, MASSIVE key point.
Put your email (website / myspace) on the CD along with the band name. How the fuck will they contact you.. there could be 100s of bands with the same name. Give them a proper certified myspace / contact and they will have a place to go when they want to phone you up.
** Centuries didn't sell the footage, it was for promo only - therefore we put full songs up for free. If you want to sell the DVD, make a montage or clips only!