Can I use Support Crew and create a Support Page if I don’t have anyone to invite as my Support Crew (support network)?

Yes.  You can create a Support Page and use the website without inviting anyone to become part of your Support Crew (support network).  In fact, you may just want to use the website to quickly and easily access or purchase the services that are available to help fulfil your specific needs such as cleaning and lawn mowing services and meal providers.