Well, I got the mod working, more or less. Initially, I gave Bodahn five of all of the Grandmaster runes, the mage staff that I created, an improved Spellweaver, and two improved Imperial Edge saw swords, just by adding them to his inventory. Then when I got to playing around with the appropriate PRCSCR template, and I added them to his inventory with that, as well, except I gave him 10 each of the GM runes, and I threw in an improved Enchanted Dagger clone that would complement Starfang. I used one of the preexisting plots that would activate my changes on the second trip to the party camp (after saving Bodahn).
Anyway, it seems that the only changes that took effect were my improvements to the Spellweaver and Imperial Edge swords, and the addition of them to Bodahn's inventory. The GM runes were there, as well, but the commands in the script to add 10 of each didn't seem to dp anything. So, I went in, and added 5 more to his inventory the way I did the first time, but it had no effect. Of course, my newly created mage staff and dagger were nowhere to be seen in-game.
I think I'm starting to get the hang of it, though.
Once again, thanks for the advice!