The Realm plane is where you initially start, and consists of three main islands. On the main island is Glyphstone village, which consists of a few buildings. Outside of the village it is possible to encounter wild animals and the occasional monster, but for real challenges (and magical treasure) you should explore the monster lairs which dot the landscape.
There is also a graphical version of the map available on the website, which you can visit here: http://www.godwars2.org/realmplane.php
The Realm plane is non-PK, providing a reasonably safe way to explore, but once you’re classed it probably won’t offer you much of a challenge any more. At this point you should use the ‘shift’ command to enter the Nexus.
See also: area nexus shift