I want to travel from Guangzhou to Shanghai and Shanghai to Harbin by fast train.

but I want to make several 1 to 3 day stops, Wuhan 2days, Hefei 1day, Nanjing 2days, Shanghai 3days then Shanghai. Leave Shanghai to Jinan 1day, Qingdao 2days, Tianjin 2days, Dalian 2days, Changchun 1day to Harbin 2days. How do I purchase tickets or what is the best way to buy them?

If I want to go to North Korea, where can I get a visa and how long it will take...I am holding a Canadian passport. Thank you so much for helping!