Again, your time will be better spent doing some research on the Park tools or Sheldon Brown sites than trying to get answers to all of the complications entailed in replacing a BB and full crankset. If you don't have the original parts it is extremely difficult for a lay person to figure out what is needed, and not possible for even a mechanic (I was one for over 20 years) to do over the Internet. You have to end up with a combination such that the cranks are reasonably symmetrical on the frame and the chainline (chainwheel to cog alignment) correct. That requires a lot of measurements, including of your rear wheel and triangle.

If you insist on doing this at home then have enough respect to do some studying on your own. I'm more than willing to help anyone fill in the gaps but your piecemeal approach is impractical. If you had followed my previous suggestion at all you would already know that an older road bike has to have a 68mm bottom bracket, for instance.