If my uncle and aunt have immigrated to Canada and are citizens (or green cards), will it help me to immigrate to Canada? How to operate specifically? thank you

Very helpful. If you are in Manitoba and Saskatchewan, they can directly sponsor your relatives to immigrate.

Not if it's in BC province

You can directly visit the website of their province, which has a detailed introduction about the nominated immigrants in the province, including whether to apply, how to apply, and what materials to prepare.

It's best not to consider a work visa. It's very difficult.