It's always a good idea to do as much research about a company before you accept a position there. Are they assisting you with work permits and such?
Have a look at our guide on the cost of living in Poland. PLN 5000 is quite an average salary, and whether this will be worth it for you will depend very much on your lifestyle. What do you do?
Hope this helps,
Whether you move to Poland will probably be a very personal decision. We have an article with some pros and cons of moving to Poland you can take a look at.
I'd advise that you talk to as many people as possible (perhaps ask your collegue to put you in contact with more people) so you can make an informed decision. Of course, you'll want to look at comparisons between India and Poland with cost of living and such. I recommend Numbeo - it also has a section on salaries and quality of life.
Hope this helps and good luck!