To get a start, it would be very difficult to talk you through it using this
forum. I would recommend that you check your bookstore for some books on
Access, many of which come with a CD-ROM with sample databases. One that has
a sample for contacts is "Microsoft Office Access 2003 Inside Out" from
Microsoft Press. Even though it is for 2003, you will find that almost all
of it will apply to Access 2000 as well. I don't know if it has been
translated into Portuguese. You can also find some samples that come with
Access, search your hard drive for Northwind.mdb once you have Access
installed. If it isn't there, you may need to do a custom install and select
the sample databases.
I believe that microsoft.public.pt.access may be the Portuguese language
newsgroup and they may have more information on what's available in your
area to help you get started.