Google's Conversion tracking - Confused please help

[suthra]

Hi guyz.,
I run several campaigns in adwords with each campaign containing several ad groups dealing with several of our websites.
Now, how do i get the conversion code. Is it enough to get single conversion code to be added in all the pages ? or should i get conversion code for each adgroup that i use?.

2)I see conversion codes based on:
lead
signup code
Purchase
and views

So to get the number of free signups to our site, is it enough for me to just put the signup code to my thankyoupage.?


Please help

Sarathy.s