Help needed to get ADSL working?

I have got a single desktop PC running Slackware 10 with an onboard
ethernet connection and USB.

From what I have read it looks like using ethernet is a simpler way of
getting connected. So I am thinking of buying a D-Link DSL-300T
modem/ethernet interface. Is this a reasonable choice?

In preparation for the connection I have been reading around and am
getting increasingly confused on what I need to do to get ADSL working.
I think part of the problem is that I am reading it all in the abstract
and it might (I hope) be less complicated than it sounds when the time
comes. But it doesn't seem like a simple 'connect it all together and it
will work' and that software needs to be set up.

Are there any idiot proof instructions around on the internet, sort of an
'ADSL connection for Dummies'?

TIA

Allan Miller
I have d-link adsl2+ router modem. it was working nicely on one fine morning my service provider(bsnl) suddenly changed my user id and password, obiously i have to feed the changed id and password in my modem. i am unable to do it with the information i could muster.
vinod pande