Help with cleansing and protection spell

Hello! I am very much a baby here. I would like some help or guidance with picking a cleansing and protection spell. Recently my step father, who was a not-so-nice person to me, passed away. I do not feel as if he has passed on yet, in fact I feel his energy with me and I am now seeing him in my dreams.

Overall I don't know where to begin my own introduction to witchcraft. I have many books, stones and some candles, but I am afraid that I may do something wrong and invite chaos.

Feel free to pm me with any advice about getting started on this journey. Thank you!!