Format external drive on macbook pro

Hi,
HI,
I have a question on " to format an external drive " (I bought an 'intenso). I have a macbook pro running mountain lion and found already some answers via different replies but before doing anything I should not do, I would like to ask you waht exactly I have to select on the disk utility
- at the left side of the disk utility : what should I choose
                               first line 1tb intenso external USB
                    OR
                              second line intenso mounted partition
- at the right hand side : what should I choose
                       selecting on first line option on the left I have 4 options at the right hand side (journaled, journaled / encypted, case sensitive /
                                                                 journaled or case sensitive / journaled / encrypted)
                    OR
                    selection the second line option on the left I have only 2 options at the right hand side ( journaled or case sensitive / journaled )
What to select ?
After doing the above, will the external be ready or do I have to do something else. Noticed somewhere "encrypt" ?
Thanks for giving me some more details.
Brigiitte

Hi,
Thank you so much but I need some more help.
The drive is new and there is nothing on it so that should be fine.
But when i go to "partition", I see indeed the "options" buttom but I can not select it. It says I have to select a partition scheme. On the screen it shows "Partition layout -- current" and when I change it to "1 partition" I can follow the steps you mentioned (I can select up to "16 partitions").
Should I select "1 partition" ? What does this mean ? Maybe you know a link where I can find info on that subject as I want to learn something more and know at least what I am doing.
Thanks.

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