Mrng, Will be in Shenzhen Airport go to Guangzhou.. advise mode of transport ...Hou much RMB ?

From the airport, you can use SZ local subway Luobao Line to reach Luohu Station. Then you can go to local railway station where you can find direct bullet trains for Guangzhou.
The subway costs about 8RMB and the bullet trains takes about 80RMB for the second class seat and 100RMB for the first class seat.