Java Newbie Exercise Help Needed

hi,

got this Java exercise package and don't know where to start! could anyone help...
a little explaining will be helpfull... not really familiar with Java


Exercise Java Package (ziped): http://skux.cokenut.net/cods/Exercise_RentalShop.zip

Exersise Spec: http://skux.cokenut.net/cods/RentalShop_Spec.doc

thanks