Canadian passport holders do not required visa to HK for 90 days. For the tourist visa to Mainland China, you'd better enquire from the consulate directly if they issue group tourist visa now (generally they do, CAD 40 per person). Or you just can book a tour from China, the travel agency will send you the required documents for a group visa application. This TCG is a good one, you can read China Tours(https://www.travelchinaguide.com/tour/default.htm) as a reference.