Newbie requiring re-installation help!

I migrated a lot of files across from my PC yesterday when my new imac arrived. However, it’s just a mess of files now, and I decided to just clean the hard drive and re-install OSX.
HOWEVER, when I re-installed, it did not give me the “erase and install” function, and instead just seems to have gone through the installation process without actually clearing the hard drive.
Two questions:
A – how do I erase and install?
B – is this likely to have been problematic given that I DIDN’T uninstall anything, erase anything, and just seem to have overlayed another installation of OSX on top of the existing one. Problematic?? Issues?
Sorry guys. This is my first mac so I’m just learning.
Thanks for your help

when i go to utilities, clear the HD and re-install, will i then have to re-install all relevant apps from the applications CD?
In general, no, but you will have to go through the setup like it was a new machine (User account info, etc). If you are using the Gray label DVD that came with your Mac, then you will get replacements for all of the Apple programs that came on your machine including the iLife programs.
People that are using a retail Black label DVD on a formatted drive because their machine came with an older OS will only get the OS and basic programs (Mail, iTunes, Safari, Address Book, DVD Player, etc). They will need to go back to the Gray label DVD they got with their machine and install the iLife programs from the optional installs folder. The only version of iLife programs that are free are the ones that shipped with your Mac.
In addition, the regular installation from the SL gray label DVD does not install some programs like the older version of QuickTime 7, Rosetta, and the developer tools. They can be installed later from the gray DVD if required.
Usual warning - formatting the drive, and installing a new OS will completely destroy all of the user files/folders/emails/photos/music and other documents and settings. If you will need any of these items on your new installation you must back them up to an external drive or DVD before you begin the re-installation.
Hope this helps.

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