Instructions
Use eBay to offer various types of coins for sale. The site offers two methods for selling items such as coins. There is a traditional auction as well as a buy-it-now feature.
Place a classified ad on Craigslist. There are millions of items posted for sale on Craigslist which is frequented by millions of visitors.
Post items for sale on a blog. There are many sites available such as Blogger and WordPress that are free to use to setup a blog.
Post at various online forums such as Coin Talk. Many websites have forums where people can post various comments about different kinds of coins.
Take a photograph of all coins to post online with an ad. A photograph is the only way a coin can be judged for its quality.