Qadha Salaah

Q: I want to ask a couple of questions regarding qadha prayers.

1. What should be my niyaah when praying qadha namaz and what time of the day should I offer it?

2. How should I offer my qadha prayers, given that I have the following ones left? (I have only made an estimation, because I don't remember the count exactly): Fajr-4, Zuhr-6, Maghrib-1, Isha-Salaat-ul-witr of 2-2.5 years (around 800)

3. Do I need to offer all of the witr prayers or is there any alternative to it? I request you to outline the complete method, so that I can offer them as quickly as possible.

Q: Is it possible to make intention during nafl salaah that the nafl salaah be accepted for any qadha salaahs that one may have - specifically qadha salaahs that one may not be knowing of e.g. when ghusl after menstruation has been delayed or when a salaah may not have been performed in a state of wudhu unintentionally or one's ankles/hair may have been exposed, thus rendering salaah invalid?

Q: Can one read voluntary prayer if one has missed prayers to make up?

Q: If my deceased parents have not been steadfast with zakaat, salaah and fasting due to reasons that I am not aware of, am I able to compensate for this, even if they have not mentioned it in their will? I would love my parents to be in Jannah, so how can I help them achieve this now that they have passed away?

Q: If a person is offering qadha of Fajr of the same day, then should he offer the sunnat first and then the fardh, or vice versa?

Q: If I have qadha salaah to perform, can I perform it after Asr salaah?

Q: I have qadha salaah from a certain year. I have read salaah in between but I'm not sure when my haiz fell during the year as well as which salaahs I read.

My question is, my intention for the qadha should be made from a specific date that my salaah became obligatory and each date so on till the current date, or should my intention be that, from the first of all the qadha I have right up until a number I assume I missed. 

Q: Regarding qadha salaah (missed prayers):

What is the full intention to make before one performs a qadha salaah (Note: the intention for ample salaah missed not just a single salaah). I am fearful that if my intention is incorrect my qadha salaah wont be accepted. Many books have the intention for only missing one prayer. 

To my knowledge the intention is "O Allah, I am reading the 1st fajr of those that I have missed" but I am unsure if it is correct.

Q: What is the method for qadhaa namaaz and fasting?

Q:

1. I have a lot of qadha salaah and I don't know exactly how much, how should I calculate all my salaah?

2. While performing my qadha salaah, can I perform all the Fajr, then all the Zuhr, then all the Asr and so on?