Hi All i am very new to this and not as computer savy as i would like i am trying to build this for my 5 year old i have the following

Raspberry Pi 3
64 gb micro sd
PS3 Controller
Bluetooth dongle

I have install the program on the sd drive and it is working but it only have 10-15 Games (No Nintendo 64 or Playstation)when i was expecting 1000's
am i missing something

Thanks in advanced