Which hardware for a simple robot

Hi
I have nearly no experience with this topic but i want to buy some parts to build myself
a simple robot. Nothing special but i don't know what hardware i will need.
Until now i made a list of hardware i think i will need.
Is there anything i forgot
or maybe some parts won't work together?

controller
https://store.arduino.cc/product/GBX00067?language=en
MotorShield
https://store.arduino.cc/product/A000079
buttons
https://store.arduino.cc/product/C000027
distance sensor
https://store.arduino.cc/product/SEN05312B
display
https://store.arduino.cc/product/C000763
LED
https://store.arduino.cc/product/C000056
battery pack
http://www.qfixshop.com/index.php/elektronik-10/stromversorgung/akku-set-9-6v-mit-adapterkabel.html
motor
https://store.arduino.cc/product/T010160
wheels
http://www.qfixshop.com/index.php/antrieb/rad-sets/rad-set-50mm-mit-3mm-achse.html
coaster 10x10x5

Is there a chassis to mount all the stuff on to?

ye it has the size 100mm x 100mm x 5mm
is that enough space for all the stuff ?

Simple bot. You could use pie pans for the wheels instead of cutting them out of wood.