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