An immigration lawyer can't help you with this process. You need to find an employer yourself who is willing to give you a job offer and also go through the LMIA process.
You should plan that the LMIA process will take 4-6 months. Once the LMIA is approved, you would then apply for the closed work permit. Plan on this taking a few additional months. So you want to make sure you come to Canada with enough money to survive 8+ months without working.