how can i reach my hotel(Jun fu hotel) from Guangzhou Baiyun Airport? Near Sanyuanli metro station.

From the airport, you can take the airport express line 1 to reach the terminal near local railway station and take a taxi to get to your hotel.
If you want to use the subway to your hotel, from the airport, you need to take the subway line 3 to reach Jiahewanggang Station and then change to line 2 to Sanyuanli Station. From there, you can take a taxi to get to your hotel.
For the subway map, you may find what you want on this webpage: https://www.travelchinaguide.com/images/map/guangdong/guangzhou-subway.gif.

From GZ South Railway Station, you can find bullet trains for Wuhan. From GZ Railway Station or East Railway Station, you can find ordinary trains to Wuhan. For the detail schedule, you may find in the Train Section on this website.