There's too much to tell you in a post on this bulletin board. You should get a book on the subject from your local "home improvement warehouse" store or elsewhere. It'll be worth the small cost.

Dig out 8" of soil and fill in with 5" of crush and run gravel. Use plate viberator on it andmake it slightly sloped. Pin in the plastic edgeing with foot long nails. lay sand then the brick on the same slight slope. Run the viberator once again. Thats a quick overview but you will need a book for the details. It's a LOT of work but you can do it yourself for about $5 a square foot and it would be in the neighborhood of $20 a square done professionaly.

I got idea about building the pave patio.
there are still sth. I am not sure about:

1)I have bay window/door above the patio, how do I handle the ground under the bay area? and minimize the effort to cut brick to fit the bay's angle?

2) I need build steps also, does it need be done before building the patio? and is there any easy way to do it?

thanks