With a 4th class ticket you will be a 3rd engineer. As a junior officer your work rotation will be 3 months on and 2 months off. Thier ships are all very modern, the oldest ones are around 15 years. I sailed with them as a cadet and then two shifts as 3rd engineer. The working conditions are good, the ships are clean and its a great way to get deep sea experiance. Their ships operate world wide so its a great way to travel as well. As 3rd you will be in charge of the boilers which is very good steam experiance. The boilers are low pressure 16 bar but quite large at around 30 t/h to run the cargo pumps. Its the best steam experience your going to get without actually sailing on a steam ship. The crew is all Philippino with officers being primarily Indian, Croatian, and Philippino. There were a few Canadians left when I was there in 2009 but I don't think there are many left sailing with the company. If your looking to make money Teekay is not the place, I would only go there for the experiance which will pay off later down the road. For a Canadian 3rd engineer the salary is around 2500 British pounds per month gross, with no overtime, health or dental benefits.
Hope this helps, good luck!