Hi,
Take a look at this page.
https://docs.unrealengine.com/latest/INT/Platforms/Mobile/MobilePackagingWizard/index.html
Once you run this wizard it will create 2 profiles, one for App packaging and second for creating DLC. Running DLC profile after App profile will create a directory where you will find chunked DLC pak (Cloud) file and manifest which you need to put on the server.
And here how to create logic for downloading and patching.
https://docs.unrealengine.com/latest/INT/Engine/Blueprints/UserGuide/PatchingNodes/index.html