Subdomain setup

I have my page organized with following structure:
www.subdomain1.domain.com
www.subdomain2.domain.com
...
www.subdomainN.domain.com

The subdomains are therefore like separate sites, even there is same design and interlinking between.

There is no link from www.domain.com to any of the subdomains.

Do I need to create a separate account for each of these subdomains or will the Co-op Ad Network validate all subdomains automatically ?

 

You can only register one of them. (one per domain)

 

Should I register www.domain.com or www.subdomain1.domain.com ?

 

whichever one you want to put the ads on.

 

I want to put ads on
www.subdomain1.domain.com
www.subdomain2.domain.com
...
www.subdomainN.domain.com

I do not want to put ads on
www.domain.com

Do I need to create account for each subdomain ?

 

Yes Yes Yes (damn 10-minimum-character-restriction)