Upgrade Preparation: How to map applications, DTS packages, SSIS packages and reports to databases

Hi,

I am on the initial phase of upgrading SQL Server 2005 to SQL Server 2012. Right now, I'm taking as much inventory as I can from our current server, SQL Server 2005. If anyone could help me, how can I map the following:

1. Map applications to databases
2. Map DTS packages to databases
3. Map SSIS packages to databases
4. Map reports to databases

Thank you!