Now you have to partition your hard disk. For simplicity's sake I select Guided - use entire disk and set up LVM - this will create one volume group with two logical volumes, one for the / file system and another one for swap (of course, the partitioning is totally up to you - if you know what you're doing, you can also set up your partitions manually).

Select the disk that you want to partition:

Then select the partitioning scheme. As mentioned before, I select All files in one partition (recommended for new users) for simplicity's sake - it's up to your likings what you choose here:

When you're asked Write the changes to disks and configure LVM?, select Yes:

When you're finished, select Finish partitioning and write changes to disk:

Select Yes when you're asked Write changes to disks?:

Afterwards, your new partitions are created and formatted.

Now the base system is installed:

Next you must configure apt. Because you are using the Debian Wheezy Netinstall CD which contains only a minimal set of packages, you must use a network mirror. Select the country where the network mirror that you want to use is located (usually this is the country where your Debian Wheezy system is located):

Then select the mirror you want to use (e.g. ftp.de.debian.org):

Unless you use an HTTP proxy, leave the following field empty and hit Continue:

Apt is now updating its packages database:

You can skip the package usage survey by selecting No:

We need a web server, DNS server, mail server, and a MySQL database, but nevertheless I don't select any of them now because I like to have full control over what gets installed on my system. We will install the needed packages manually later on. Therefore we just select Standard system utilities and SSH server (so that I can immediately connect to the system with an SSH client such as PuTTY after the installation has finished) and hit Continue:

The required packages are downloaded and installed on the system:

When you're asked Install the GRUB boot loader to the master boot record?, select Yes:

The base system installation is now finished. Remove the Debian Wheezy Netinstall CD from the CD drive and hit Continue to reboot the system:

On to the next step...