well tour definently not going to be able to build an android or anything for your first robot. start small!
not necessarily true, my first real robot was Chives the butler robot
hmmm something cool ...
a robot that shoots an object
r/c robot with a camera
simple robot arm
joystick controlled gun aimer and shooter ( toy gun mounted on tilt and pan servos)
if you start small you will learn better and not struggle ( i struggled a lot with Chives , waaaay too much hours online researching)