starbucks lor.......... seems like a lot of starbucks are hiring now. There's no special method or tricks to look for retail jobs. Just prepare a lot of resume, go to one of the malls and hand resume to all the shops.
If you are interested in admin/office job, you can post your resume to recuiting companies like Adecco or Miles. You can work as on-call once they hire you. However, I'm not sure how often you will get calls. You should be able to find a lot temp openings at monster.ca
As for jobs.gc.ca, you may give it a try. However, a lot of companies post their ad on the site only to fullfill the fair policy (or equal opportunity, whatever it's called, but you know what I mean). By law, when there's an job opening, the company cannot hire internally only. They have to post the job opening in public so that other people will have a chance to apply. So a lot of companies post the job postings on jobs.gc.ca just 做樣. Most of the time, they have already had a destinated canidate.