The way you're using it here, the pa- prefix indicates that the actor is moving in a certain direction. Another example would be papunta: "Sumakay ka ng jeepney papunta sa mall." / "Ride (you) a jeepney going to the mall." "Lumakad na sila pauwi." / "They already walked home." There are other ways to use pa- in addition to this, including demonstrating causation. "Ipapagawa ko ito sa iyo." / "I will make you do this." "Nagpabili siya ng sagin sa akin." / "She asked me to buy her a banana." "Pinakain nya ang bata." / "He fed the child." Keep it up!