I suggest you start by driving just one digit. Connect one of the common anodes to 5V. Connect the cathodes for that digit to the 7447 outputs using 7 series resistors, e.g. 220R. Connect the 4 BCD inputs of the 7447 to 4 Arduino digital pins (don't use 0 or 1). Write a simple sketch to count from 0 to 9.To drive the other two digits, probably the simplest option for you is to use 2 more 7447 ics. Another more interesting option would be to multiplex the display. For this, you would only need a 7447 chip but also 3 pnp transistors, e.g. bc327.There are many more ways to drive this display. What other chips and components do you have to hand?