Do you want to know which partition layout to plan for (sizes?) In which case the forum has many threads of persons posting their disk allocation. Do you remember how you set up the 8.3 disk? Is your question about which disk setup utility to use? Do you have data on the disk that is backed up? That you wish to preserve?
I'd not be able to answer most questions, but others might if you give more details, IOW.
(Also, threads containing bsdinstall, sysinstall might be informative.)