Hi,
The fastest way to get started with Sling Models on 5.6.1 is to download the package from https://github.com/Adobe-Consulting-Services/com.adobe.acs.bundles.sling-models/releases/tag/com.adobe.acs.bundles.sling-models-1.0.2 and install it in your AEM instance. This will give you the two bundles you need at runtime.
Then, in your bundle project, you need to do two things (aside from actually creating the model classes/interfaces):
1. Add this dependency:
<dependency> <groupId>org.apache.sling</groupId> <artifactId>org.apache.sling.models.api</artifactId> <version>1.0.0</version> <scope>provided</scope> </dependency>
2. In the <configuration> element inside the plugin definition for the maven-bundle-plugin add this:
<instructions> <Sling-Model-Packages> com.myco.mypackage </Sling-Model-Packages> </instructions>
Note that you might already have an <instructions> element, in which case just add <Sling-Model-Packages> inside that existing <instructions> element.
If this doesn't solve your problem, please post more details on exactly what is going wrong.
Regards,
Justin