will be staying near Gunanmen/Guilin Central Sq area.

I Where should I go to take a direct bus to Yangshuo downtown ? What is the exact location of the bus stop in Guilin / the frequency of the bus service and do I need to book advance tickets or just turn up earlier on date/time of departure ? Also what is the exact location of the bus stop in Yangshuo ?

Thanks for your assistance
KOH