Starting wlan0 instead of eth0

[Jason Edson <jasonedson@gmail.com>]

I'm new to this part of my debian system. Instead of having eth0 load
up when my system starts, I want to run a script that enables my
wireless card(wlan0) that uses ndiswrapper to load. My script looks
like this:

#!/bin/bash
echo "Starting wireless networking....."
ifconfig eth0 down
modprobe ndiswrapper
sleep 1
iwconfig wlan0 mode Managed
iwconfig wlan0 essid cocksmoker
iwconfig wlan0 key blahblahblahmynetkey
dhcpcd -t 10 -d -G 192.168.1.1 wlan0
echo "Wireless networking started.....hopefully!"

I don't know how to achive this so any pointers or links for some
reading would be very appreciated. Thanks for your time.