Sourav,
You need to create a branded installer (.ipa) file that will take the base Agentry client and allow you to set the Icon, Name, startup images. In order to perform the branding you will need to join the Apple Enterprise Developer program and setup your application id and provisioning profile that is needed to generate your branded .ipa file.
Once you have your .ipa file you can test load on devices through iTunes to test the .ipa and then load into Afaria for deployment based on your policies.
For an overview of the process plesae refer to KBA #1923242 (http://service.sap.com/sap/support/notes/1923242)
--Bill