Now, those are just the first two disks--when Warp 3 (and even 4) came out, drives larger than 4Gb were NOT the norm. To accommodate these outlandish drive sizes, IBM had to release updates of the first two installation disks to provide support for the larger media. You don't need them unless you drive is over 4Gb (doubtful on a PS/2, unless the original drive has been replaced), but even with these, you will still need the rest of the install kit.
My Warp 4 install sets make no mention of the ability to create install floppies from the CD, though this was not an uncommon notion "back in the day".
Warp 3, on the other hand, I have in both formats and is commonly available on ebay for next to nothing. Warp 3 is really fine, especially on an older computer. If you want to do web surfing, or other internet related things, 4 is probably better, but play with 3 and see if you like it.
About your first question, we have several businesses; we sell retail systems, we have a pizza place, a tanning salon and a hair salon. We are what you would call diversified.