Some nice sections and the new SDK for Microsoft CRM
Version 3.0.5 of the Microsoft CRM 3.0 is now available on MSDN online! This version of the SDK includes new sample code, consolidated attribute information, topic enhancements, and bug fixes. Get a full look at it here: https://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0microsoftcrmv3d0sdk.asp
You might want to see specific items so i would suggest in taking a look at these sections of the SDK:
ISV Programming Guide: https://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0isvguidelines.asp
Support and Certification: https://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0supportandcertification.asp
Customization Points: https://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0customizationpoints.asp
Develop and Deploy: https://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0developanddeploy.asp
Best Practices:
https://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0bestpractices.asp