Please help me to install opensuse 11.1 on external hdd

Hi Everybody,
I am very very linux user. Come from window xp. Just now I installed the opensuse 11.1 (with dual boot with window xp) on my acer travelmate3010. And I want to install the opensuse 11.1 into my external HDD (30 GB). How should I start?

Thank alot for your adivce.

Thank alot for your quick reply, AndreasStieger.
Let me try.

Thar Soe