Sponsored visa
To get a work visa, you need to find a company willing to give you a job. You will also need the appropriate qualifications. If you have a four-year degree from a reputable university, that should be enough. If you have anything less then things will be more difficult. For example, if you have a 2-year degree or diploma, or an MBA from an institution nobody has heard of, then you and your potential employer will have to argue your case with the immigration department.
When you find a company willing to employ you, that company will sponsor your work visa application. All they have to do is fill out forms giving details about the company and saying they will employ you. This is easy enough, but in theory you are not allowed to actually start work until your visa comes through, which takes one to two months. In practice, there are apparently ways around this, depending on how scrupulous you and the company are.