Focusing on a frame with lots of objects?

I have a question.
what if i want to take a photo, that the theme consists of lots of objects,( for example, a cityscape/landscape photography ) and i want everything to be in focus and nothing out or blured.

i own a Nikon d3000 and using a 18-55mm and a 18-105 nikon lenses.
( please forgive my newbie question.

For landscapes, you need to shoot using the wide angle end of your zoom lens (18 mm in your case)

To get the most depth you need to stop the lens down to about f/16 of f/22.

To prevent blur, you will have to place the camera on a tripod. Blur is caused by camera or subject movement.