Jon,
You are not an idiot! Slalom boards require a lot more tuning than my regular riders (longboard and park), not to say that they don't benefit from some of the tuning.
As to your board:
Bahne Blackhill - This is a fine entry board, but Consider options such as the Sk8kings AXE series, Pocket Pistols, Chi-ill, Skaterbuilt. They and others have good moderately priced boards. The Blackhill is a bit of a retro style, with cutaway nose and tail, and if it suits you, then fine. I've ridden one, and it's a nice responsive deck, just not for my style.
Trucks - I've never ridden seismic - on the forum here most discuss their use as a rear truck in the stable geometry version. Seismic's aren't used much on the front. Also, not that it is difficult, but tuning a seismic can require springs be replaced, just as bushings are used to tune a conventional truck - it's just a bit more difficult and expensive to have several sets.
I'd lock at an RT-X tracker on the front along with that RT-S rear. A nice bushing assortment like the Khiro kits would allow you to fine tune your turning.
68-69-70mm wheels like Hot Spots and Zig Zags are the standard wheel for slalom. Some riders prefer a smaller wheel for Tight Slalom (I do, I use the 66mm Zigs). Smaller wheels have less roll speed, but seem to provide faster action for turning, as well as more wheel clearance for narrow trucks on tight slalom. Somehow they seem to offer more tenacious grip.
Wedging is used to cause the truck to steer faster (positive), or slower (negative or de-wedge). Front trucks are positive wedged (thick part at rear of truck) to cause the truck to steer faster. Opposite on the rear where thick wedging at the rear slows down the truck for better traction.
Bearing spacers keep the bearings properly aligned on the axle, and prevent binding. For slalom wheels they all take 1 10mm spacer per wheel.
Everyone on this board that knows me knows I am a huge fan of the AXE series from Sk8kings. I suggest taking a look at a retailer like Sk8kings where they will customize the board you choose with proper wedging and hardware, a nice selection of wheels, bearings, spacers, grip tape, the works. The AXE completes they sell are a great value, and ready to race out of the box.
http://www.sk8kings.com
Welcome to the forum!
RonO