Printing from iPhone?

I have the iPlanner app on my iPhone5 that contains all my work shifts for 2013 in the form of a year planner. There is an option within the app to print out the year planner but im not sure how to do this.

What do I need to be able to print out this year planner from my iPhone? Do I just need my printer to be connected to my home network, or is there a way of connecting a cable from my iPhone to my printer?

Thanks :)