The plan includes a domain name for your company. To find a domain name that is available, use this website, but DON'T purchase it. I will register it, as it's price is included in your yearly fee.

The com in .com stands for commercial, which is why most commercial businesses use it. A .org domain name stands for organization, and is used by non-profit organizations. A .net domain is usually used as a middle ground, for sites that are not neccessarily commercial businesses, but are also not organizations.