Your domain name is the same. You can't own it unless you have some server address. Many people buy domain names and never use them. It does avoid confusion to own all the related names to your company's name, but in most cases it really isn't necessary. If you decide to buy al related names you should get one page of server space through NSI and make redirect pages to your actual site.
Most surfers just notice a quick flash and have no idea that they have been re-routed.
It is your job to create the content. It is your job to come up with ideas and a marketing plan for the site. If you need help with this you can hire an internet consultant or a marketing consultant. I do give consultations, but I am primarily a designer. I also can configure your mail server when you sign up with Hurrican Electric through me.