Take a look at the WR tutorial (Help|Books Online menu option in WR) - it demonstrates how to write scripts against the sample Flight Application.
A big tip for you at this stage:
Avoid the overwhelming temptation to do the first couple of pages of the tutorial and then jump headlong into your application or worse still, MS Word/Excel etc (which contain loads of custom classes and are a nightmare with WR).
Working with the Flight App will give you a good basic grounding which you can then build on when you tackle your own AUT.
Monitor these forums and also the WinRunner group on Yahoo (you can search for it at http://groups.yahoo.com) as they both have decent traffic and a good pool of knowledgable posters.
<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>Originally posted by davidchen_00: How/where should I start to learn WinRunner?
What's the steps to learn?
Any good sample application that is best for beginner to start with? <HR></BLOCKQUOTE>
Yes, the flight app that comes with WR is the best to start with since they have ensured that this app has all the pieces that WR uses.
If you decide to try with another item, choose a not too complex one like Phone Dialer or maybe Notepad. Make sure it's something you already know and are aware of all the functions of it. It's too difficult to learn WR while also learning an application.
Start with navigation recording of the application and look at the generated code to see what it looks like and does. Good luck.