Yes if you put content on it first. But why would you do that? Wait until everything is up and running and you have traffic..
why not? do you have one adsense account or yet to apply? in case you want to apply then have some valuable content before applying for one account
Yes, you can. Adsense dont bother about the extension as long as you are fulfill the adsense requirement
Thats correct. If you got the unique and original contents, google will provide you opportunity to earn from it.
i prefer to use your own domain instead of free as that can close any time . second if you have your own domain you can promote it and the flip it also .
Yes you can use it but it's better if you go with .com domain as there are few sites which allowed you to register it for $4.95! Adsense needs quality website that's it!
you can use google adsense on the domain , you can also park the domain , the instructions are available on the screen of .co.cc itself follow that if you wish to park