If you wait until you retire (unless retiring happens in 5-10 years maybe), you might not be able to afford the gear.
Stuff is pretty expensive even now, depending on what you want, what you can get, and such. Or, maybe you'll get lucky - several years ago I scored an Altair for $200 from a local electronics junkyard; later I went back and scoured it for a bunch of S-100 cards (as is, it came with a full complement).
Later I got some things off ebay, and even some free items from some other collectors - all I had to pay for was shipping. One strange beast was a 6502 cpu PCB (unpopulated) - I am not sure if it is compatible with the Altair's S-100 bus layout, or if it is meant for some other machine (the bus wasn't as standard as one would like, unfortunately).
Anyhow, good luck with your dream - just collecting the stuff can be fun enough!
I have an Altair - when I bought it, it came with a controller card for an 8-inch floppy system...with one slight difference:
It was for so-called "hard sectored" drives.
If you know about floppies, you know they have a timing hole near the hub ring; as this flies past a sensor, the controller can use it to keep the speed of the motor constant, as well as determine what sector on a track is currently under the head of the drive. Depending on timing and other factors, it can allow for varying size sectors - this is known as "soft sectors".
Hard sector drives had a similar sensor, but the floppies had - instead of a single hole - multiple holes spaced around the hub - one hole for each sector, hence "hard sectored"...
It was mainly a difference with the media and controller, not so much the drive itself, IIRC.
The problem is that, if I ever could even find an actual drive for the system, I'd probably never find any media; as it is, it's getting more difficult to find 5.25" media in the old 8-bit era "low-density" format - at least, anything new (similarly, low-density 3.5" floppies are difficult to find - which stinks for Amiga owners).
High density floppies in both 5.25" and 3.5" sizes are much easier to find - though the 5.25" drives can be an issue (not that they are hard to find, but sometimes the prices are thru the roof - mainly because of demand from industrial controllers that used PCs for CNC control needing replacements).
Most standard PC floppy controllers, the kind on the motherboard of a typical x86 machine made right into the early 21st century, can drive a standard Shugart-style 8" disk drive. Though some controllers don't handle single-density disks.