Personally i'd play a flat 4141, can add up arrows on your ML/R and DL/R if you fancy it and play down both wings.

If you know you're going to be there, i'd be happy enough starting normal, press own half and counter attack with the option then to change if things aren't happening for you. If you aren't gonna be there, you need to score 3 goals minimum to win the tie so i think you'd have to start attacking. Obv message your mates and make sure you get your 5% from the crowd.

Best of luck