Few ?'s I need clarified........

Im gettin a dry kit going to be spraying 100-125 shot........Should I spray before of after the maf?

Can I take my car to get tunned as is(stock with Nitrous kit on) or do I need a special engine management? I plan on getting the flip chip and a bigger fuel pump when I up the shot later down the road......

What plugs?

How much will a flip chip run me?