what kind of transportation im goin to take from macau to xiamen

From M, there is no direct bus to reach Xiamen, so you need to pass the border and go to the Gongbei Long-distance Bus Station to find the buses for Xiamen.
From Gongbei Bus Station, there are two buses to reach Xiamen Hubin Bus Station and the bus fare is around 290RMB. The buses are at 18:00 and 18:50.