You can click to the following website:
http://www.hkjc.com/chinese/jobs/parttime_gjob_chi.asp
and then click:
電話投注事務助理
you can fill in the application form & then send. It is the whole procedure for applying your job in Tsuen Wan/Tsing Yi telephone betting centre.
Or
http://www.hkjc.com/chinese/jobs/recruitday.asp
No, HK Jockey Club will provide training & have a test before you really are in position. It's an easy job. I've done this job before!!!
At that time, I had only a 20 minutes break for my dinner organised by your supervisor during work.