Most importantly, a review of the application must determine that hiring a foreign national will have a positive or neutral effect on the Canadian job market. Further, the application must make it clear that no Canadian filled that position and had to offer this to a foreign national. To clarify, LMIA process varies depending on the wage of the position.
You must hire through the temporary foreign workers program (TFWP) if you need an LMIA. Further to this, TFWP lets the employers hire foreign workers to fill temporary skill and labour shortage. Once you get a positive decision, you should provide a copy of the confirmation letter to each temporary worker and advise them to apply for a work permit.