Nedrin, this question is asked every so often and you might check the search feature for prior responses. The real answer to this, though, is that there are no standards. Everyone, particularly with basement bars, builds to fit the situation.
If you really need direction, I suggest that you go bar hopping and find out which place has the bar that feels the most comfortable to you. Then build yours to match. The moldings and brass rail and similar accessories are availble.
Be careful on your research project and don't forget the designated driver. He might also get to be in charge of the tape measure.