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@Dylan
get a long straight stiff ruler, put it flat against your front chainring and see where the chain should be relative to your rear cog.
The rest you just adjust to get it right, washers and so on, self explanatory really. Failing that you get a proper BB for the job, either bigger or smaller depending which way you need to go if you don't mind playing around with the Q factor.
you might need to re-dish your wheel if it's a tight frame.
edit] if your about to build your wheels, work out all this before you start, maybe a proper sized hub will prevent all this hassle, so your cog can sit directly in the chainline by default, no dishing or anything.