Data driven Approach can be used. For this first datatable 
has to be prepared which will contain the test data for 
each of the test cases. Now scripting can be done which 
will satisfy the test cases.

Firstly you need to find out which test case are important, 
then you need to write generic test script ( using QTP but 
not putting ur programming skills). I mean to say that u 
should not apply the entire coding ok. Then u have to put 
them in .vbs file and call them.

After writing testcases first u l analyse which testcases 
can be automated like usability testcases cannot be 
automated, u  l prioritise depending upon the functionality.

hi santhi here
Firstly you need to find out which test case are important, 
then you need to write generic test script 
Then u have to put them in .vbs file and call them.
After writing test cases first I can analyse which test 
cases 
can be automated like usability test cases cannot be 
automated, I  prioritise depending upon the functionality

After writing test cases, analyze and identify the test 
cases which are falling under regression suite. Then study 
which can be automatable using the tool (Here, tool 
selection is important criteria). Once finalizing the test 
cases that can be automated, analyze the suitable framework 
that fits.