Preparing disk for ASM and best practices

 Hi,

we are preparing disks to be used for ASM disk group for 2 node 10g RAC system on Oracle Linux 5

When we do fdisk -l, we see the following

Disk /dev/sda: 146.7 GB, 146798542848 bytes
255 heads, 63 sectors/track, 17847 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sda doesn't contain a valid partition table

Disk /dev/sdb: 146.7 GB, 146798542848 bytes
255 heads, 63 sectors/track, 17847 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn't contain a valid partition table

Our questions are

1. we need to first partition the disk(s) using --> fdisk /dev/sda and fdisk /dev/sdb. Correct?
2. We should create a "primary" (P) partition and not an "extended" (E) partition for each disk. correct?