Lebar, it's best for you to talk to a recruiter to receive the latest information regarding service in the Reserves. There are different categories of Reserve service, some are for occasional service (Class A, up to 14 days a month) some for short periods of continuous service (Class B, or a combination known as Class B(A) for a specific "term") and some for provision of services equivalent to a Regular Force member (Class C). As noted previously, you are probably thinking of Class A service, where the unit requires a certain level of committment (days) to 'parade', like the "once a week", "every XXXday", etc... Also as noted, unless you are already trained for a particular occupation/trade, you would likely not be eligible for the continuous terms of Class B or Class C service. The Recruiting Centre could provide the latest information.
Regards,
G2G