Depending on the plan you choose, this may be included in the price.

All companies listed here offer domain registration, so it is best to pick the hosting company and when you sign up for web site service, register your domain name at this time.

The exception to this is if obtaining a particular domain name is critical to your business, or it is special and unique enough to merit registering it now to reserve for future use. You will have one extra step of migrating the Domain Name Service over to your new provider. Not a huge deal.

Is domain name important ? It is if you want to brand your web site. If the domain you want is chosen, you can add dashes or try the .net or .biz endings.