Lord Krishna: Pastimes of Lord Krishna

Q. While reading Krishna Book I read that Garuda, a pure devotee of Lord Vishnu, used to visit Vrindavana and would eat fish from Yamuna River. I also read that every living entity in Vrindavan is a devotee of Lord Krishna. It follows that the fishes were also devotees of the Lord. How can we understand this act of Garuda? My doubt is that in Vrindavan, especially when Lord Krishna was personally present, all living beings (including fishes) in Vrindavan were in their spiritual form. How can living being in spiritual form be killed?

Q. We all know of the great epic of Lord Krishna, the holy war between good and bad but on the other end I have few questions unanswered:

Q. What happened to Krishna after Mahabharata? As per my information he was shot by someone on his foot thinking it to be a deer's eye, but are we telling that the disappearance of God from this world was just like that? Who ruled Mathura after His departure?

Mausala Lila or the disappearance of Lord Krishna is described in response to Digest 60C.

Q. If Bhishma was a devotee of the Lord, then why did he choose to fight against the Pandavas? Also why did he have to undergo a painful situation of lying down in a bed of arrows?

In addition, why didn't Bhishmadev surrender to Lord Krishna like Vibhishana surrendered to Lord Rama? Is it because Bhishma gave more importance to his vow (his dharma) than to surrender to Krishna?

Q. Can you please explain how we can follow the Supreme Lord's teachings without imitating His deeds during His pastimes?

Q. I have heard that while killing Putana, Krishna closed His eyes. On this, various spotless Vaishnava Acharyas have written commentaries which differ from each other. One Acharya writes that Krishna closed His eyes so as not to see the heinous face of the infant-killer. Some other Acharya writes that because He was killing a female, He closed His eyes...  and so on. (Krishna Book, Ch 6) So, how to understand this phenomenon?

Q. What austerities were done by Yasoda to obtain Krishna as her son? Why is Subhadra worshipped with Krishna and Balarama?

Q. Every time Krishna destroys the world after each era and when He comes back on earth does He repeat the same Lilas all the time without any changes?

Please note that Krishna appears once in each day of Brahma. During Brahma's night there is a partial devastation, which seems to be what you are referring to within your question.

The answer is that the same theme of each of His pastimes repeats, but there are variations of these lilas. Here is one example, taken from Brhat-Bhagavatamrita, found below.
   ____

Kesi and Arishtasura

BB 3.6.255

Q. If Krishna knows everything that is going to happen, and has complete control of everything, then how is this leela fun for Him? Wouldn't it be entertainment for Krishna only if there was some degree of suspense?

Q. How did Krishna disappear from the material world in that lila?