You could fill your departure and arrival city names in the search form, after choosing the correct one in the drop-down list, you can click the search button to check more.

From Guangzhou to Lijiang or Dali, there are no direct trains. You have to transfer at Kunming. Besides, in the third question, do you mean Dongchuan District under the jurisdiction of Kunming? In that case, you also need to take train to Kunming first.