To add extra analog inputs to your Arduino you'll be wanting to use an additional chip, something like the 74HC4051 (click for datasheet
) which acts like a switch box - you tell it which of the up to 8 sensors attached to it you want to read from, and it connects that physical leg with the leg that you have wired to a single analog pin on your Arduino. There will be lots of tutorials about on how to use these and they're quite straightforward to set up and use too.
* I have almost zero experience with eletronics.
You've come to the right community to learn, in my experience
There are plenty of examples of how to get started with this chip online. Start with this one on the Arduino Playground
but there are lots if you google search terms like Arduino 4051 tutorial
(link to result).
GeoffEdit: fixed some of that appalling spelling!