right foot

Q:

1. When leaving the house, is it sunnah to leave with the right foot or left foot, some Ulama say one should leave with the right foot and others say one should leave with the left foot, which one is correct?

2. Did Nabi Muhammad (Sallallahu Alaihi Wasallam) leave the house with the right foot or the left foot?

Is there any hadith Reference for the above?

Q: What is the wisdom and reason behind entering the toilet with the left foot and exiting with the right, or putting on shoes and clothes starting with the right and removing them starting with the left etc. (besides the fact that it is a Sunnah)?