laws and procedure you can find here: migrant .info.pl/Economic_activity_in_Poland.html
find idea - especially the great one is much more difficult question anyway Good luck.
Related: Auto szrot in Western Europe - a good idea for business in Poland?
I don't know how to call "szrot" in English, but I would like to ask you, is this form of sale very popular in western europe? However I know, that many Poles go to France or Belgium to buy meny staff at those "szrotach", brign it to Poland and sale. They earn quite much money for this.
So, maybe I should go too?
Szrot in English (relating to cars) means trading in scrapped and written-off cars. OK for spare parts maybe, but unreliable for a whole car.