alv program

Hi,

I want to create an alv report where in which i want to select the data from knvp(kunnr,vkorg) and knvv(loevm) tables.The selection screen should have following fields.

kunnr(knvp),vkorg(knvp),loevm(knvv).The o/p should have following fields.knvp(kunnr,vkorg,parvw,kunn2),knvv(loevm).Can anyone tell me how to create an alv report program(sample program) for this?

Regards,

Hema