^ignore the above post. sorry if i sound rude.
When you create a partition, leave the other options as they are and set the mount point to /. Thats it.
Also, you will like to create another partition as a swap partition about twice the size of your RAM. The swap works like pagefile in Windows.
Also, you should allocate a little more space, about 20 GB or so for Linux if you wish to install more programs later.