Tour planning at south China

A group of people (10-16) from Turkey would like to visit south China. We want to have a tour around Guilin/Yangshou ethnic minorities. They will arrive with direct flight to Guangzhou. They will return from Hong Kong. I would appreciate if we can communicate on the itenerary and price options for a 6-10 day trip for half board. An English speaking guide and bus/train options needs to be included. This trip can take place in October or November. When is the best time to visit that region? I would like to comnmunicate through my email so that we can discuss alternatives.
Thanks and regards.