hi how can i go from Quanzhou to nanjing and what is the best way plus the costs?

You have two ways to Nanjing from Quanzhou, by train and by air.
By train: There is on train in operation from Quanzhou t Nanjing each day: D3137/D3136. It departs at 10:03 and takes about 11 h. The ticket fare is about CNY 483 for first-class seat and CNY 403 for second-class seat.
By air: There is direct plane from Qaunzhou to Nanjing. It only takes about nearly 2 h. The ticket fare is about CNY 870 for economy seat or more for other seat.
If you wanna book the ticket in advance, the following websites may help.
https://www.travelchinaguide.com/china-trains/
https://www.travelchinaguide.com/china-flights/