If your company name is rather long and hard to remember, then choose something that's easy to remember and associates with your product or service. Net is for entities and computers that represent part of the Internet's infrastructure. After you identify the name you want for your web address, you can search the databases of the particular web address registrar. If your first choice is not available, you can try another web address. If you can't think of a name, some providers can even generate some relevant available options when you enter some keywords describing your business.
Most domain names are valid for two years.
When you are ready to renew your web address, simply go back to the registrar of the domain name and renew it. Domain name registration is a service that most web design houses offer. If not, you can go directly to the databases listed above and register a name yourself. If the name you want is registered, you might be able to purchase it from one of these domain name-brokering companies. Your best bet would be to try another name.