help to access linux remote

Hi,

I have the following network at home.

ADSL router Zyxel Prestige 600 connected to one of the 4 extensions
(10/100) I connect my router D-link 614+. From that I have one wire
connection (winxp comp) and one wireless connection (suse 10).

If I install VNC ( free version) on each computer how shall I setup my
D-link 614+ so I can access my computers from outside?

Is it better to access my home computers via ssh? What do I have to do
to make that work?

Or is there any better way to do this? ( free since I don't have the
money to spend :-))

cheers,

//mikael