Great, I actually guessed I could use it with jumper cables directly without breadboard if needed. Thanks for making that clear.
Regarding the things I think I'll need, I plan to keep it simple(ish) and have a Servo controller (to move the robot) and an adc (to acquire data) connected to the Raspberry PI through i2c. I guess that between that and a handful of sensors I can keep myself busy for a moment coding and testing, lol.
I guess I'm not done asking questions here, hope to post some results soon though ;-)