Help with Septa

Hey guys, I just moved to Philly for work. My office is in Ambler and I will be staying near Suburban station. I have to take a daily (4 days a week) train between these stations (Ambler comes in zone 3). Apart from this I'll go out a little on the weekends so I'd use the train and bus service in the city. I haven't figured out the SEPTA system of passes yet but what would be the most economical way of going about this?