Escort Boy 1

Right lads and ladies i have been thinking about my options long and hard and decided that turbocharging my current 1.8 zetec focus is the way to go, my missus loves the car and it will be simply to expencive for me to buy another car and turbo charge that, i have heard alot of good things about the zetec turbo and have done searching as much as i can but cant seem to find the answers to my questions, right here are a few for you:

What am i going to need to get to do this conversion?
Is the current 1.8 zetec blacktop a good base to use or do i need to change engines?
Rough Price of conversion?

I will be doing all the work apart from the electrics and the management so will save that wise, i am not looking for huge power atm but would like to future proof it as i would like to throttle body it later on, many thanks for any help.