hi!
in addition to what aussie is saying, you must speak polish to be considered in LOT,and probably have a work permit if you come from outside the EU.
your basic salary as a FO in the first year will be around 5800zl=2850 USD plus per diem(500-800zl) and overtime if you fly more than 67 hours but currently we are just flying around 45-50hrs a month in the ERJ145 fleet.