New to BSP

I am newbie to BSP.My requirement goes here under.

We have a workflow set up for Travel management and the approvals will be done in Lotus Notes.

The proposed solution is as follows.

I need to develop a BSP page which will be called by Lotus (on click of button in Lotus Notes mail). Lotus will send 3 paramaters Personnel number, Trip number and a text (Approve, Reject or Revise) as a query string attached to the URL.

The values of these 3 parameters are passed to a FM to trigger back the Workflow and continue its process.

This is my first interaction with Web programming.

Can anyone explain as how to proceed?

Your response will be highly appreciated.

regards,

Chenna