Be VERY careful that you don't get scammed or ripped-off. There are agencies that will promise you work and charge you a lot of money. Then nothing... Or worse, will supply you with a fake LMO... We have seen a number of cases on here where someone elses LMO was copied and the name changed. In fact, one person even received a modified copy that was found on Google Images.
Example... http://www.canadavisa.com/canada-immigration-discussion-board/-t184144.0.html
If you are not sure, ask on here and someone will be able to help you about known good/bad agencies.