It is good to have general computer skills, typing at least 35 wpm, basic knowledge of the most commonly used office programs such as Word, Excel, Microsoft Outlook, Powerpoint. etc., good telephone skills, experience with multi-line phones, good written and oral communication skills, and good organizational skills.
I guess if it's purely admin/clerical and not as far as secretarial then you would want to have good I.T. and keyboard skills, good levels of numeracy and literacy, a keen eye for detail, to be self motivated and to be able to cope with high volumes of work if necessary. A good phone manner, and confidence on the telephone, would also be advantageous.
)