Q: Models created in alfresco are not displaying automatically when I add a document 1)created models following the steps on alfresco site
2)Models not getting displayed when I  add a document (before saving it).
2)when I add a document -> go on edit properties -> All properties-> models not displayed.

A: You need to register the types in share-config.xml. When u navigate to edit properties of a document u can find "Change Type" option, once you register your types in said xml, you can see a drop down of the type
<alfresco-config>
   <config evaluator="string-compare" condition="DocumentLibrary">
    <types>
        <type name="cm:content">
            <!-- Custom sub-type added for whitepapers -->
            <subtype name="my:whitepaper" />
        </type>
        <type name="cm:folder">
        </type>
        <type name="trx:transferTarget">
            <subtype name="trx:fileTransferTarget" />
        </type>
    </types>
   </config> 
</alfresco-config>

as mentioned here
