Creating VPS Partitions On Dedicated Server For My Own Use

more experience Linux users to partition my dedi into VPS. I have an Intel Quadcore 2.4 Ghz, 500GB HDD, 2GB DDR RAM, dedicated server with a max 100mbit connection and 2000GB BW/mo. It has Centos 5.3 (centos-release-5-3.el5.centos.1) installed on the server and I want to install the DirectAdmin CP soon.

I'm not a reseller or webhost and don't intend to become one. This server is for my exclusive use.

I want to use half the server to run virtual instances of a Windows 2008 server and a KDE or similar Linux virtual desktop using FreeNX as well as a 4PSA VoIP Now or similar software. The other half of the drive will be to run my businesses websites, mailserver, a DNS server, etc.

I have six IP addresses for this server that can be used to this end and will host at least three websites (under separate domain names) and one or two blogs for which I will install requisite software.

I understand that the RHEL 5 embedded virtualization software will allow me to partition the server into VPS for various purposes.

Here are the outputs from ckdisk -l and parted -l respectively for the current HDD partitions.

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 60801 488279610 8e Linux LVM
[root@denprivatevaert ~]# parted -l

Model: ATA ST3500320AS (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
1 32.3kB 107MB 107MB primary ext3 boot
2 107MB 500GB 500GB primary lvm

Error: Unable to open /dev/md0 - unrecognised disk label.

For the DA install, so I don't have to try to figure out where things are, I'd like to use their more complex partition structure as follows:

/boot 40 meg
swap 2 x memory
/tmp 1 Gig. Highly recommended to mount /tmp with noexec,nosuid in /etc/fstab
/ 6-10 Gig
/usr 5-12 gig. Just DA data, source code, frontpage.
/home rest of drive. Roughly 80% for user data. Mount with nosuid in /etc/fstab if possible.

I will install dovecot to be able to create SSL access to my webmail so don't need a '/var' directory.

What I want to know is:

1) Should install virtualization and partition the drive prior to having DA installed?

2) How do I best partition the drive into VPSes so I can run distinctly different virtual instances of different OS and/or programs on the VPS as well as use half for websites, blogs, servers, etc.?

3) What else do I have to keep in mind when doing this?

I'd appreciate any positive, useful response and information on getting this done and I'd like to try to get this done by Monday or Tuesday of next week so DA can be installed on the appropriate partition.