2. Connected the Photocells (voltage divider 15K resistor to Vcc)
What is the resistance of the photo cells in the levels of light that you plan to use it in?
What do I need to change do to make this function? I am clueless! Is this a software issue?
I'd guess the 15k resistors, but you need to measure the photo cells with an Ohm-meter (DMM in Ohm range) at two levels:
The background level that the 'bot will drive around in.
And the level of the light that you want it to chase.
If you don't have a DMM, borrow or buy one - you cannot make any electronics without one. It doesn't have to be expensive, just the cheapest that you can find ($4 to $10 should do).