Pointers from Anyone- visiting Guangzhou & Chaozhou- Chao'an (Anpu)

I am from Vancouver, Canada. I plan to visit CZ- Chao'an (Anpu) where my father originated. He went to Singapore in his early age. We are Tan (Chen) clan. I speak CZ and I understand my paternal grandmother was Seah. I wonder if is there a way I can trace the roots before I visit. Any pointers?