First of all, you don't install it through the BIOS. The BIOS is a set of settings that tells the operating system how to use the available hardware that makes up your computer. Windows is installed from a disk drive or from a USB drive. Occasionally even from a network drive. In your case you will be installing from DVD. You will insert it in the drive and if your BIOS boot settings are set for the CD/DVD drive as the first boot option you will be asked to press any key to boot from there once it reads the Windows disk in the drive.
If not, you may need to go into BIOS and set the optical drive (CD/DVD) to be the first boot drive or change the boot drive options by pressing whatever key at startup is required to do so according to what motherboard you have. Knowing your hardware information would help me in providing you with the proper instructions. Once you get to the point where you can start booting from the drive and it loads up you will need to enter the key that will come with the packaging. The rest is mainly just following the guided program.
On another note, I would not recommend the OEM version. I would recommend the Retail full version unless you absolutely know you will never be upgrading your hardware such as the motherboard or building an entirely new system, and want to then install it on there for use. In the case of a laptop, that you will never be purchasing another laptop or getting one used that you will want to use the operating system on. The OEM version only allows for installation on one computer ever.
If you change the motherboard or build an entirely new system, you cannot re-activate the operating system for the new device. With the retail full version, you can, as long as you assure Microsoft by phone activation that you do in fact only have it installed on one computer at any given time. It's only about twenty bucks more for the retail version so it makes a lot of sense to go that route but of course the choice is yours.