Basically I am building a fixie. I have all the parts except for the bottom brackets, the headset and the stem. I didn't buy them because I am not sure about the size and dimensions I need to get.
The frame is an old francesco moser frame.

The diameter of the bottom bracket is 40mm and the length is 70mm. As you can see on the attached picture it also has some threading on both sides.
The diameter of the fork tube is 25mm, and the diameter of the tube it goes into is 33mm.
I am sorry about my terminology but I am new to all this.
I would be very grateful if you could recommend which parts I should buy.