I have a big project
You have that is true a very big project, because you have not yet identified what product would be appropriate or in demand in a country as Poland. It's not sufficient to think that you can just look at one commodity like tea for example. Think you need to do a little bit more homework before the project can move forward ?
The thing is you are looking at very basic marketing principles first and foremost and should be applying those. I'm sure you know what they are if you are a 'marketing Major" ?
I'm sure when you have done a bit more work yourself and are a bit clearer than maybe someone on here could give you pointers on the logistics of then moving the product in a country like Poland.
Good Luck. :)