Hello Edwin,
What type of custom module are you installing? Is it a custom static module or dynamic module (via Module builder)?
For static module you can use the Install method of the module's class. You can check the following sample of the ProductsModule in git hub:
https://github.com/Sitefinity-SDK/Telerik.Sitefinity.Samples.Products/blob/master/Products/ProductsModule.cs
For dynamic module you can use the EventHub and subscribe to the ... event:
http://docs.sitefinity.com/event-system-eventhub
Regards,
Pavel Benov
Telerik
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