If you have a GoPro4 you might want the one with the H4-3D ... They are almost the same, but the GoPro4 has a slightly different balance on the gimbal and some cut out for a new side button on the GoPro4. You can reconfigure the H3-3D in software to compensate for the balance, but might need to put in a shim to prevent the side button from being hit. Some people have no issue with GP4 on the H3 gimbal, others do. Some people don't mind tinkering ... other's want turnkey simplicity.
http://www.amazon.com/DJI-Phantom-Quadcopter-Bundle-Zenmuse/dp/B00SHUEPBK/
Other than that for time delay photography or basic video, you are set.
Only if you also want a live preview feed to frame your shots will you need to do anything else. If not, just turn on the camera, take it up in the air and point it at your subject.
For live SD preview:
Technically ... Due to the power of those video transmitters, you'll also want to get yourself an entry level HAM radio license if you are operating this in the US.
For live HD preview ... Buy yourself an Inspire 1. The cost of the included HD stream system alone ($1400 DJI Lightbridge) makes the Inspire 1 a better buy then adding it a Phantom 2. Crazy, but that's the state of live HD wireless feeds right now.