You can say "I break your power, I bind you in the name of Jesus, I come against, I fire back arrows that are aimed (mind, heart, family, etc) back to hell right now, I plead the blood of Jesus, every evil spirit (start naming whatever it is) I thwart your plans in Jesus name, I dismantle every wickled and evil scheme, etc
It's important to make sure that you have the spirit of God and exercise your authority. I recommend you read "The Believer's Authority" by Kenneth Hagin. Or you can pray in the spirit. Also, it's important to fast and pray because it helps you during spiritual warfare.