problem in working with installshield 2010

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Visual-Studio

msi

setup

Hi all,
I am new in installshield.I have written a class library project with visual studio that creates a sql database with sql commands.Now i want to call a method of this dll in my installshield setup project.but i do not know how can i call my method in a specific location in user interface sequence and also how should i pass arguments to the method.
Is there any references that describe how should i do that step by step??
pls help me...

Note : I have used InstallScript MSI project type to create my setup project.