Qadha Salaah

Question relating to Qadha Salaah

Q:

  1. What is the procedure of doing missed Qada namaz of last 10 years, approximately 500 salaahs?
  2. What will be intention?
  3. How many Rakat for each salat?
  4. Is there qada for witr?
  5. As I have lots of missed namaz, can I do qada salat instead of doing any nawafil as well tahajud? Please explain in detail so that I can do it.