I heard a great line once that's stuck with me over the years...
"Building a beautiful website, is like putting on your best clothes and then standing in a very dark corner; it doesn't matter what you look like if no one can see you"
For me websites are amazing things, but I would rather than tonnes of relevant traffic and a basic website than a beautiful site and no traffic.
The key to getting clients then is not to worry about your image, but where you're going to get that traffic from. Some of the suggestions above hit the nail on the head so I won't repeat them but in general I find these help:
1. Lead generation sites e.g. People Per Hour - great site and concept but it is worldwide so prepare to be competing on price for most projects with competitors in much lower cost base countries. In this instance getting a portfolio online that makes you stand apart is key.
2. PPC e.g. adwords - I have lots of experience in this and most of my businesses have used it as a primary source of quality traffic but it can be very expensive so use it only when you have free money to burn until you get your campaigns spot on.
3. Networks - there are lots of different types of networks, they could be linkedin (although as a new company you won't really get traction on this in the short term), they could be local breakfast clubs (the largest of which is BNI, and that will work for you but beware, BNI is a business that effectively makes you pay them to get them more business! (Great model!)) and then there's your own contacts. You can reach out to people to refer to you, whether as a white label or not. Referrals are how you grow your business. Anyone using people per hour or adwords will tell you they aren't the most cost effective sources of leads in high competition markets BUT they give you a platform from which to grow your referrals (which are much more cost effective). Make sure with referrals that you incentivise people financially, or else once they refer the first time they won't do it again and really you need to build a loyal base of raving loonies who love what you do and want to refer because it gets their friends a great service and improves their lives.