You may get ripped off by doing that. And if they quote you a price you're happy with, then you've deffo been ripped off.
Start with the China, look for the makers mark underneath and google it. Even stuff from the 70's sells. Then there's condition, complete sets etc etc
There loads of advice I could give, but the best bit would be investigate it yourself. If you can whittle it down the a few bits then there are valuation days round and about. There was one at Lytham Hall a few weeks ago which would be helpful (basically they look, think the price they can get about what profit they want and offer you the base price.)
I wouldn't class myself as an expert but do know a bit.