there is no easy way, you have to leanr how to use it.
Ares can place the components automatically if you define the board edge but the placement is a mess and you will have to either start moving components or start placing manually from from scratch, the engine can't see that a small movement can make a connection possible.
So after you make your schematic in isis you press the ares button, if you have any schematic components that don't have pcb info you will receive errors.
In ares go to component mode and place your components, then open design rule manager to set the layers and pad specification.
After that you can use the autorouter, if it can make 100% of the connections you are fine, if not you can start moving components or make jumpers or you can even do the traces manually.
start from simple designs with a few components.
Alex