No idea about the Czech side, but from Munich airport you can take the train to Weiden and then further on to Vohenstrauss or Waidhaus via train/bus, from there you can just take a taxi it will be cheap (relatively), go to
https://www.bahn.com/en
Tipping, I'd be careful, last I heard the casino keeps part or all of the tips, so better don't, the rake is pretty outrageous anyway. Outside the casino 10-15% for good service, mediocre/bad service less or none