is it easy to get eu funds? how much money i could get? ( i have polish passport)
No, it's not easy at all. EU funds are in desperately short supply at the moment - if you're not in one of the 'priority' groups (unemployed, under 25, over 50, disabled, returning to work after giving birth) - then you're not going to get anything. There are funds available for unemployed people (equal to 6 months minimum wage) - but these funds, again, aren't in huge supply and you'll struggle if you aren't in a priority group.
EU money for bigger projects is possible, but you'll need to have a significant amount of money behind you before thinking about that. Polish banks aren't too happy to lend money at the moment, so you can forget about getting a loan on the basis of EU money.
The fact that you want to try in Krakow is even more against you - you might have some success in smaller, more deprived provinces (think Lubuskie or Podkarpackie) if you can generate employment.
Why do you want to set up a business in Poland?