In order to fax directly to your subject you will ned to connect to a Land
Phone Line....
There are locations which allow you to email a fax and then they fax forward
it..
http://www.google.ca/search?sourceid=navclient&aq=t&ie=UTF-8&rlz=1T4ADBF_enCA224
CA224&q=internet+fax+service

In my Canadian location my phone company allows me to do this for a nominal
fee
peter

If you plan on sending the fax directly from your home without passing
through any other services and using only the software built into your
Dell - you would likely have to hook a phone line to whatever dial-up modem
you have (you may have one of those in addition to your network connection)
and then you can utilize the service like you seem to be used to doing...

To send a fax otherwise (using what you actually have - broadband - and
connecting nothing else up - but probably installing software and passwing
through a third party to send said fax) - you will need to research and
purchase a service and use it like they tell you to.  Look into "fax over
broadband" services using Google.