Before beginning, you'll really want a copy of the data sheet for each type of IC. For the LS7266, you can get it from US Digital's webpage. For the LS138's, download it from Fairchild Semiconductor. Most datasheets, these 2 included, require Adobe's Acrobat reader to view. Make sure you have it before downloading the datasheets.
With ISA bus map, datasheets and schematic in hand, get to the wiring.
First off, get 2 wirewrap posts and insert them into the card near the LS7266 power input pins (pins 3 and 12). Leave a little room between the power pin and the wirewrap post, so you can connect them without things getting too crowded. When the posts are set in good and snug, flip the card over and get the .1uF capacitors. Take one and solder the tails to the posts you just inserted, one tail per post. If you got the ceramic caps like I suggested you don't need to worry about polarity. Just pick a tail and solder it down. When that's done, get your wirewrap tool and connect each pin to its respective post (be sure to follow the links that describe wrapping before you do this). Repeat this procedure for each of the LS138 IC's. The power pins for those are 8 and 16.
These capacitors are important, since they make sure that the power supplied to each IC has minimal noise, something that can cause problems. It's always a good thing to have one cap per chip, and to keep that cap as near as possible to minimize noise that might sneak in between the cap and the chip.
With this done, you can mark off the wires to the capacitors as done (always keep the schematic nearby and mark finished wiring on it with a Hi-Lite marker or similar). Don't forget to run the wires from the caps you just installed to the power leads off the ISA bus. All of the +5VDC lines go to ISA bus line B29, and all GND lines go to B31. Refer to the ISA bus map and the schematic page to make sure you wrap them to the right posts.
With power done, press on to the data and address lines. Follow the schematic, take your time, and keep double-checking what you're doing. Again, you're reading the schematic from the top, and wiring from the bottom. Don't let yourself get confused. Mark off the wires you've done, and keep them short to avoid a rat's nest of wire that's impossible to trace visually. It shouldn't take more than a couple hours, even if you work slowly.
More to come....