Fan installation

Long story short I got a new case it came with preinstalled fans three in the front one in the back has the option to mount three 120 mm fans on the top so I don’t know much about the fans or the airflow I wanted to come to you to ask your opinion. I was thinking I could have one fan blowing down one fan blowing up and another one blowing down or one blowing up one blowing down and another one blowing up.