This is a great interview and discussion with Fr. Chad Ripperger regarding spiritual warfare and using deliverance prayers to deal with demonic oppression/obsession/infestation.
I encourage you check it out and get his book titled, Deliverance Prayers For Use By The Laity. It’s in multiple languages now.
Does Not Make You an “Exorcist”
The goal is NOT to pretend your an exorcist and go after the demons by yourself. DO NOT do that. Follow Fr. Ripperger’s advice on this and you’ll be able to better combat the evil spirits plaguing your life (as well as the lives of those under your familial authority).
For another website that has some of those deliverance prayers, check here.
Catholics Aren't Zombies! 