The best method is to open the help file on QTP and read it. Also go through the tutorial which comes with QTP. Mercury has self training packages on their site and many Mercury partners offer group & individual training. Are you familiar with VBScript. If not, you should learn it.
Success is the ability to go from one failure to another with no loss of enthusiasm.
~ Winston Churchill ~
Did you RTFM (Read The Friendly Manual) or look at its Tutorial (which is actually pretty good). I highly recommend going through the tutorial that comes with QTP (I assume you are working with 8.x). Otherwise there is a discussion area specific to QTP on this forum site, you may want to do specific searches there.
For VBScript specific questions you can go to Microsoft MSDN site and look at the VBScript and Windows Scripting Host (WSH) online documentation for more help in that area.