+1 It's not rocket surgery, but it sure helps to at least see a picture of what proper installation looks like. There are pics on this site, but for LOTS of questions like this the best answer is probably one of the old bike maintenance books from the 70s & 80s. I have the 'Bicycling Magazine Complete Guide to Bike Maintenance' and 'Sloane's New Bicycle Maintenance Book' both of them from Amazon marketplace, under $5/each shipped.
The kit you have sounds wrong for your bike, and you'll end up wasting a good bit if you use it. If unopened, I'd return it; if opened hold onto it for some later bike project...'cause you are sure to have one.
A better/nicer/more vintage-friendly LBS will sell you regular brake housing by the foot. Usually they have colors too! Same for derailleur housing, might as well make them match. On an older, pre-index shifting bike the same housing serves for both. You may have to convince younger folks at the LBS that this is true, but it is.
