MH doesn't really launch fare sales that far advance (February 2018?). They are also upgrading their reservation system to Amadeus 10 June so their fare sales are a bit limited during this crossover (they did have one recently ex-KUL tho).

Having that said, I don't know if you are traveling around Chinese New Year. If you are, then you should book your tickets sooner than later.

Are you flying all the way from Canada or will you have a stopover in HKG or will your Canada-HKG-KUL fight on CX? If it is CX/KA, then you have the benefit of through-check bags from KA to MH (also arrival lounge/domestic departure lounge at KUL if you are eligible).

Air Asia departs from KLIA2 (stupid name for a terminal, but it's Terminal 2). You'll have to collect your bags at KLIA (Terminal 1), buy a MYR 2 train ticket to Terminal 2, then check-in again with Air Asia. That's quite a lot of hassle if you don't know what you are doing and you need to make sure you have enough connecting time (I would say 2 hours at the very minimum) because AK will force you to buy a new ticket if you miss their check-in deadline.