dividing A4 sheet evenly, it's for a raffle

Hi guys

Maybe it's obvious but I'm not able to figure it out: how can I divide evenly 18 names on an entire A4 sheet: 6 rows x 3 columns = 18 cells. It's a raffle. I used a template for Letter size but changing to A4 is really driving me crazy.

Besides I don't know why Excel is reserving space on left and right side even when I set 0 for all margins. This is for printing purposes.

Pls I need your help ASAP

Regards and thanks

PS: Windows 7 x64, MS Excel 2007