If you have a website then you probably have your own domain. You have registered your own domain because you want to be on your own or because you have found a nice domain name. The process of registration is simple and quick. You enter the name you want to register, contact details, pay the registration fee and the domain is yours. It will be yours until it expires or you decide to sell it.
When registering a domain you should never enter fake contact details. If you would like to have some privacy and not disclose your details then you should use domain privacy service offered at most registrars. Make sure the administrative email you have entered is valid and you can access it. You will need this email address when you would like to sell or transfer the domain. The same address will be used to remind you that your domain is about to expire.
Selling a domain can be very profitable if you are lucky to find a short and brandable name. But it can be also a painstaking process. You never know who is the person interested in your valuable asset. Anybody can use a whois service to find domain details including the registration period and your contact details. You should be extremely careful when responding to offers and payment via PayPal. You may receive the funds in advance but this does not guarantee the success of the business. For all intangible goods PayPal will return the funds to the buyer if he has raised a dispute. In such case you will loose you domain because the registrar doesn't care about what were the circumstances.
A much better way of selling it is to use a specialized transfer service where you have to pay a small fee. Here you can also list your domain and attract potential buyers. To be able to list and sell a domain you can simply enter it at one of many sell and buy services. Once the domain is listed there anybody interested in your domain can contact you and negotiate for price. The transfer of domain is simple and usually done by the company offering the service. Of course, the transfer is not free but you are assured that you will get the money for your valuable domain.
Domain names are a valuable asset. You should always have valid contact data at your registrar. Before your domain will expire you will get a reminder and you will have a lot of time to extend the registration. And when you find a opportunity to sell the domain, just go for it if the price is good. You only need to make sure that you will not transfer your valuable domain for free since there are a lot of frauds with online transactions.