Doubts in automatino framewrok

[pkdhake]

I am very confusing while automating my application

I have small web application which I want to automate using QTP n VB Script.
I have 15-20 test cases which I want to automate but I don't understand how to automate them
I have following queries
How to automate that test cases means whether should I create only one(single) test n create different

functions/ Actions for different test cases
OR
Create separate test for each test cases
OR
Create class n functions within it and access them from test
OR
While writing script which option should use either OR or DP