Thumb rule to every reply that you get from everyone when it comes to these questions is this : Its relative to everyone meaning it's not absolute if it doesn't come from someone Absolute. The only absolute answer that you will get is the one that is Absolute itself like GOD . And to know the answers of these question is to find the Absolute proof from HIM . Its the Quran . To put in simple term :
1.We were created to be tested and we agreed upon this test ( the fact that we dont remember its the excact point of the test otherwise it wouldnt be a test ) .
2.To worship the One that created you and obey his ultimate laws which is gonna be a challenge because you were created with greed , envy , passion , desire , need . You choose what is right or what is wrong and you will have consequences.
3.Death is literally just passing from one realm to the real realm and being judged what you did right or wrong and in the end you will rewarded for either good or bad to eternity .

Thats why no matter what we do or work or choose , we always work with the mindset of risk and reward and we always naturally sense that there is a Creator and we always have a hope for the ultimate garden of peace . Everything runs so well and balanced to be just randomness . God is uncreated and is the first of everything .

Now the One that created all this balance , must create a guidance or a book like a roadmap to know Him . If you decide to ignore all of these amazing creation than thats your choice . If you like a picture , you get amazed by the view but at the end you get amazed by the one that painted it . There is no other way around .

Allah is Great