Are you having trouble creating the hotspots or adding links to the hotpots?
To create the hotspots:
In design view click the image that you want to have hotspots and make sure that the Properties panel is open. In the bottom left corner click the tool for the type of shape you want (Rectangular, Oval or Polygon) then draw that shape over the area where you want the hotspot to be. Repeat for all the hotspots you want.
To link to your hotspots:
Click on a hotspot and then in the Properties panel type into the Link box or browse to the picture or page you want to display. Choose a target where you want the link to open from the dropdown list. Repeat for all other hotspots.
If you type 'image map' into the search box in Dreamweaver's help there is further information there.