Javier,

As mentioned above, the Urban Observing Club which can be found here provides a list of both deep sky objects and double stars that you can look at. At the bottom of the page you can download sheets for both the deep sky objects, the double and variable stars and a guide on observing in light polluted areas. Then you can use Stellarium or an Atlas to locate the items if you want.

I'll also state that the more one observes the easier it becomes to find objects as you train your eye on what to look for and see.