List of screws:

• 16x M3x35
• 8x M3x40
• 40x M3x6
• 6x M3x10

If you will print just one box you don't need to print the side latch and handle and you will need less screws. The side parts are used to stack with another box.
No need support.

It is easy to assemble but if you have any questions feel free to ask.