I use Fedora instead of SuSE, but I can't help but think the process must be very similar.
First, if the computer is really, REALLY old, it may not be up to the job. I've gotten Fedora Core 3 to load on a 200 MHz Pentium with 128 MB RAM, but it's pretty slow. You will also need at least a couple of gigabytes of hard disk space (although this can be spread over more than one hard drive).
Now to the point. The installation process in Fedora invokes Disk Druid. Disk Druid either automatically partitions or allows you to manually partition your hard drive. It then properly formats those partitions for Linux's use. SuSE must either use Disk Druid or some other partitioning program during its installation process.
If the drive with no OS on it is completely empty, you have absolutely nothing to lose but time, so just try it. If you let the automated process generate default partitions, you will very likely end up with a working computer. If Something Bad happens, download DBAN (Darik's Boot and Nuke), zero-fill the hard drive, and start over.
BTW, it really helps to use a high speed CD-ROM drive for the install. The one in that old machine could be ten or twenty times slower than modern units. If you have a late model spare, temporarily switching them may save you lots of time.