The most common way to make a fire without matches or a lighter is by turning for some time a little round wooden stick that is in contact with another piece of wood with small thin pieces of wood in it. It can take long time to get fire by this way.
To construct a shelter you can get some long fallen branches from the trees and to put them in a shape of a cone. Then you can make a paste with leaves and soil mixed with water and to cover the cone with it.
The easier way to make signals for help is by lighting a fire in an area without trees so that people who is looking for you can see it from the air.
Well, after looking the Internet for different answers about how can I make a fire, a shelter or signaling for help I found that there are many sites where you can get information on these subjects.