I have some questions on migrating from WinRunner to QTP

1. How can I have a startup script when I start QTP that loads all kinds of defaults?
2. How can I load an object repository from Quality Center within QTP?
Set RepositoryFrom = CreateObject("Mercury.ObjectRepositoryUtil")
RepositoryFrom.Load "[QualityCenter] Subject\Test \Repository1.tsr"
doesn't do the trick
3. How do I get within QTP the application object in VBScript?
Just using: Set qtApp = CreateObject("QuickTest.Application")
Isn't the application object loaded by default when I am in advanced view?