To sell an item over the Internet you need to keep in mind that you will have to pay the sales tax and delivery charges so include that in your price calculations. Also, if you are planning on using EBay to sell your item you will pay a fee to use their site.
To sell items over the internet, you should firstly know how to use the internet then you should locate websites that permit individuals to sell items on their site.
Be careful about collecting sales tax for either your place of residence or informing the buyers of their obligation to pay the sales tax. Get a method of payment, such as paypal, that does not require checks or cash to be sent along with the item.
Price of products on other sites should be kept in mind so that people get obliged to choose products on your site where they are at more nominal rate.
You should know if the site that you are selling off of is safe to give your information. You should also know if the person that is buying from you is reliable. And make sure that the site that you are selling on is one you trust.