Hey Adam-
FIrst off, welcome. You've found a great resource of helpful folks who share the same hobby you're getting into. I can help with a few of your questions; first off the SPDIF is a digital connection that you wouldn't use unless you had a digital source, like a UA5 (which is a pre-amp and A/D converter.) You wouldn't need to mess with that at this point.
As far as your mics and BB go, I'd PM Chris Church. He is a regular on this board and from what I have seen provides great support and many around these parts love his mics/pres. Also, if you haven't already, check out the Yard Sale. Often time you can find the gear you want used. Buying used gear is a great value, b/c you can get better gear at a cheaper price. Also, the retail board has a lot of info on Church Audio products.
Good luck!
Jesse