small shot of nitrous is a relative term
check out cold fusion nitrous kits. real nice quality and good price! you're gonna want safety devices for the nitrous such as a window switch and/or WOT switch.
theres tons of ways to set up nitrous and you're gonna have to figure out what you want. is the car auto or 5 speed? another thing too for any nitrous setup, i highly recommend installing a wideband (a/f ratio) sensor on the car so you can make sure you're not going lean. nitrous can really screw some stuff up if you dont set it up correctly. have fun, its addictive. when i first installed nitrous in my mustang, i thoguht id be happy with a small 75 shot. i was wrong.