If you have the application up and running, the first steps would be adding some data. If you have data in a shapefile, wfs service or database you can follow the geotools layer documentation to add this data into your application. See the documentation: http://files.geomajas.org/maven/trunk/geomajas/geomajas-layer-geotools-documentation/html/master.html for further details.
In the archetype there is already a shapefile configured, so you have an example there on how to configure the definition.
The main steps for a vectorlayer are:
- Configure your server layer in Spring (layer.xml): the actual Layer (ShapeInMemLayer, GeotoolsLayer,...).
- Configure your client layer in Spring: this results typically in clientLayer.xml and layer.xml
- Add the layers to the map configuration (mapMain.xml, refer to your clientVectorLayerInfo)
that should do the trick.
To limit the map bounds to only your country, have a look at initialBounds on the map configuration.
Also, don't hesitate to ask things on the geomajas mailing list, they are really helpful there. Cheers.