To my knowledge, absolutely the best series of tutorials for Carrara is done by Mark Bremmer (he is the moderator here) and is available on VTC. The tutorials have not been updated to C8 yet, but if you are new to Carrara, C7 tutorials should have plenty of information to get you started. You can get a monthly membership to view the tutorials on VTC, and they have some introductory chapters available to watch for free, so you can see if you like the style.

I bought Mark's C6 tutorials back when C7 wasn't available yet, and I don't know what I would've done without them. I am thinking I am due for the update when C8 ones come out, even though I've been using Carrara for a few years now.

(edited for minor spelling errors)