OpenSUSE Install :: Partitioning External Drive - Screen Was Just Blank Black With The Flashing White Line

this is my first time doing a custom partition, I tried to do it with only the assistance of reading as I go, but I don't believe I found enough information last night. What I am trying to do, is put openSUSE on 200gb out of 500gb space on my external hard drive, as well as on 50gb space out of 110gb on my internal hard drive. The remaining 60gb space on my internal drive is going to be for microsoft windows. The remaining 300gb space on my external drive will be storage space. It seems like what I want to do is achievable

What I want is to have my main openSUSE on the external drive (primary partition I think?), with the GRUB loader so that when the external drive is not plugged in, my little brother can use windows on my internal hard drive. I tried this last night, and when installation had finished, I rebooted my computer and the screen was just blank black with the flashing white line as if waiting for me to type, although it would not allow me to type when I tried. It would be great if someone could tell me the order in which to partition, including the terms primary partition, extended partition, and logical partition, as needed.. I don't want to permanently muck up this machine.