So I can help you with this (and hopefully a few others), but there are a few things we need to be clear on before I go any further....
You will need:
A hosted database set up
-know the DB name/password/IP address
-create a table in that DB, with columns for all of the variables you want to store
An understanding of PHP/SQL/Ajax
-you don't need to be a programming expert, but it is very important to at least understand what the PHP pages will be doing. (You would be amazed at how many people want to use PHP but have no desire to understand how any of it works)
-while this is completely doable in C2, it's likely going to take some trial and error to get it working for your exact needs.
I will post an example capx and the required PHP pages when I get home, hopefully it will shed some light on what you will need to do.