What is the first question you would ask after dying, and returning to the Afterlife?

I note you accept failure in advance. Maybe you should not invite criticism?

My chance to ask questions will die with my biological body. After that I will be judged and sent to the final place off existence I have chosen. Heaven or Hell.

I won't be asking questions.  I will be bowing down, falling on my face and worshipping and THANKING MY SAVIOUR for dying on the Cross for my sins and not making me take the punishment I deserved that He took for me, but instead loving me so much that He was willing to forgive me when I didn't deserve it.   I am always thanking Him here on earth but it will be such a privilege to meet the One who actually loved me so much that He was willing to die for me. Wow, I owe Him so very much. It will be a pleasure to thank Him, and worship Him in person - that will be all I will care about I'm sure.

I believe that the most important thing is salvation, which the Lord has given freely to those who convert to Him. After physical death, the afterlife will be made up of saved people, and people to be condemned to hell.

About the only true religion of GOD and their Leaders whom GOD appointed during their eras, from the beginning up till the end of the world.

How do you return to the after life

A "life between life" I think you mean by "returning". If that were the case, I'd ask:

Can I go again? And this time REMEMBER? :D

Update: I currently do not believe in an afterlife. But if there is one, it's likely to be reincarnation.