Being an engineer is a great career. I'm an Electical Engineer and have been paid to travel the world specifying and overseeing the installation of equipment. Salaries range from country to country and are largely dependant on the company than the location.
How much you can earn? Well. how long is a piece of string. My uncle started his own company and is now one of the richest guys in this country.
I would have no hesitation in recommending it as a career. You won't earn a lot to start with, but performance and experience soon earn you the respect and money.