2. if you get a router with a dhcp server you should be able to use adsl. just set your ip to 168.192.0.1 or something similar. its described in the manual of the router. The router acts as a gateway to the internet and it gets an external ip address from your provider automatically.
1. dunno much about that. just note that afaik there is no dvd player for CSS encrypted dvds for the amiga since that takes a commercial licence. maybe decss has been ported... dunno.