Cloudlfare and hummingbird

Hello
I read your blog about CloudFlare and Hummingbird.
I am using their free account, not ready for enterprise yet. I have set up the multisite using the wildcard.
Can I add the subdomains one by one to my Cloudflare account, even they are created using wildcard??
Also, I want to verify about www. I should not have a CName for www when I have multisite on the subdomain, correct???
I would appreciate any help on this matter.
Regards
Sophie