I'm planing to fly poland for work.
That's not how it works. You get a job with a Polish company while you are still in Bangladesh, then the company that hires you gets a work permit for you. The chances are very low that you will be able to find a job if you just show up in Poland. You will almost certainly not even be granted a visa unless you already have a job lined up before you leave Bangladesh.
What kind of work were you expecting to find?
