I need to setup website to sell items wholesale but haven't a clue how get started?

[Jake]

You may find that getting prospects to the site is a more daunting task than setting up the site, marketplaces like mentioned in the other answers have ready made traffic, for a fee.

There are ecommerce site specialty hosts that have shopping cart and payment processing setup, some are priced based on the size of your inventory, you can expect to pay perhaps $20/mo for these easier to setup hosts than a typical $8/mo generic shared host. Some hosts have mini trial accounts with paid upgrades when you get going.

Here are a couple of "free" estore hosts that a quick search for: free ecommerce site host, brought up:
http://www.vendio.com/ecommerce/free-hosting
http://www.host1free.com/ecommerce-hosting/
http://www.openentry.com/
http://www.vstore.ca/
(I can't vouch for their quality, expect upgrade offers)

Adwords can bring qualified prospects but it is expensive, optimizing the site conversion rate as well as the ad campaign is crucial for getting profitable ads., typically ecommerce site get 1 sale per 50-200 visitors, Adwords ads may cost $0.50 to over $2 per click, that would translate to anywhere between, $25 to $400 to make one sale based on my imaginary numbers. Well established sites tend to have higher conversion rates and can also afford to break even on the first sale or 2 when securing a new customer, knowing they profit in the long run.

Getting 'free' traffic from search engines is a slow building alternative way to get prospects, you have to invest a lot of time creating extra original text content and getting links from other sites, you can't scale up seo traffic overnight like you can paid ad traffic.