Cross Country flight: what do I have to consider concerning radio communications?
There are three categories of radio communication to deal for each leg of a flight:


arrival and departure airport: tower/CTAF, ATIS/ASOS/AWOS, Ground/Clearance Delivery
En route ATC: arrival/departure, center
En route weather and information: Flight Service, Flightwatch, HIWAS, en-route ATIS


You have to decide which of these services you will interact with, and know where to find the frequencies (almost always a chart or the A/FD) and how to contact each of them.