Hi all,
I think you can get all the things that you need for hiking including Maps, Compass, shoes, etc from a shop called Protrek. You can have a look at their website
http://www.protrek.com.hk for what they sell and where the shops are.
Katanga, The countryside map series that you got from esdlife online shop should povide you detail path of the countryside hikes. However, if you want to know how difficult of the paths like Dragon's back, etc, i recommand you to buy any one of the two books: Walker's Companion or Hiking all in one. Both books have Chinese and English description of different popular path and their difficulty. You can have a check on the Chinese section of the big book store like the commercial press.
I hope this can help. Cheers and maybe we will meet up on the countryside one day.