The short answer is that you don't. This is a site for asking and answering questions. If you are here for any other reason besides sharing knowledge, you might find that this site is not for you.
Now, you are allowed to put a link to your business in your profile. However, you are not allowed to put it anywhere else. So don't list a business or product in the answers, questions, discussion pages, or community forum. As for personal messages, only give such details to whoever asks for them. If you randomly PM a bunch of people about your site, you will likely be blocked.
the only way you can sell things is to sell them to someone on the site if they have enough money
The requirements for buying and selling things online is different for every site that you go to. Go to the site that you wish to sell or buy things on and follow their instructions.
you can sell on eBay or Craig's list or any other auction site.
WikiAnswers is not a site where you can ask others to sell you things, it is a question and answer site for information only.
It depends on the legislation of the country in question
There most definetly are reviews on cars on that website. they sell many types of cars and you can use the site for many things.
Well, its better because the things that they sell on eBay are cheaper, but at the same time its not good because a lot of the things they sell there are used, broken, and dirty. eBay is a site where people that have things they don't want like t-shirts, toys, instruments, and etc. sell all that stuff.
Norsk is a woodworking company that specializes in designing and creating Norwegian wood carvings. The Norsk site states that they are also known to sell registered Norwegian Fjord horses.
Craig's List is a popular site that does not charge. http://www.craigslist.com
From either Ksl or Amazon or any other site that can sell you things for really cheap. (: Hopefully this can help you! XD
I would start by going to the Disney site because they have a ton of ways to save money and offer coupons. they also will sell things at a discount if you bundle things
No