Connecting flight at PEK

I land in terminal 3 (international flight) and need to get a connecting domestic flight from terminal 2. I have around 3 hours to make the transfer.

Q. Where do I check in for my connecting flight with China Eastern airlines?
Q. Is there an internal transfer route in the airport, or do I need to go through full security?
Q. Will I have to collect baggage and then check it back in before the connecting flight?

Thanks