I will be visiting Guangzhou in November for one or two nights. I arrive in HK International Airport at 7:30am and I am considering to take a train from HK. Would this be the most efficient way to get there?

During my visit to Guangzhou I would like to purchase a select few replica (knock off) items (watches, hand bags etc.) and I am only interested in replica's of the highest quality. Where should I focus my time to purchase these items?