I don't really see a big advantage to putting it under one company name. I've tried that and found it is better to either put everything on website, or have different websites. There is such a thing as a "hub and spoke" approach that some use, but I personally didn't find it all that worthwhile.

You should try to avoid that. You should read up on domain privacy.

In internet marketing, the sad truth is that many marketers will pull your whois data to find out what other websites you've built.

In my opinion, you should try to avoid this.

Unless you're doing this more for the 'branding' aspect, in which case I would just recommend you give your business credit in the footer of all your network sites.

Thanks friend, didn't even think of this. I need to do private registrations on all future domains.

Hey.. not a good idea to put all your website under one company name .. either you can do like that to have some friendly sites or sites network in your all sites footer...

What I can say is that you should concentrate on one website at a time if you want to make money online. You can do many things even with one website like selling digital products whilst also promoting other things. As you succeed, then you can build another one.