in simple steps
I would look for pictures of the one you are interested in. The manufacturers' websites are a good place to look. Some of them may even have some basic 2D drawings. Then, just explore what sketches and features you need to model it. Hope this helps.
thank you sir,give tutorial for it
I cannot model it for you as I am doing a repair install of my software at the moment, but I have some suggestions. Video-Tutorials.Net is a good online tutorial for CAD software. if you want to know how to create a model of simple water tap, you can contact this Email id: email@example.com.
web site: www.video-tutorials.net/vtnet/
I have one video on ToolBox Videos - Ball bearings tool of this company , you can see here: http://www.youtube.com/watch?v=JJzoqP3ZuV8.
Hope this information helpful for you! Have a great day!