Do you believe in an afterlife? If so, what does it look like to you? How does it work?

Yes I do , I see myself in the streets of germany during a ww2 era and recently I saw myself going on a mission to rescue prisioner of war from Imperial Japan Army.

Yes, although I'm not sure which theory I believe the most. The one I'm thinking the most is:
The possibility of a soul leaving a dead body and being free to roam the universe, uncovering mysteries that cannot be solved before death !!!!

Yes, I do .
In India there is astrology call Naadi Shastra, or Nadi Astrology which talks about your past life and karma of your past life causes action of your this life. The circle of deeds.
I have many Dreams of languages I don't know and places I don't know I went and speak or read in my dreams that's weird and I wonder a lot about it.
Soul is eternal thing so our soul remembers a lot life after life.
I want to answer your question in religious way.
I am Hindu, we worship God's and among God's there is deva(god) calls Yamraj . Yamaraj is god of death . He takes our soul and decide whether person should live or die , but this things done by individual good deeds and bad deeds , you die but your deeds will be with you even in afterlife.
And the one who die accidentally , they need to spend their life as a soul in bhootal (earth). We know them as ghost and etc.. your this life or recent good/bad deeds decides your afterlife so people try to do or perform as much as good karma.
If my answer don't appeals you than forgive me.

If you're a decent person, then something good happens to your soul. If you're not, then something not so good happens. I'm Christian so I think that the good thing that happens is heaven and that the bad thing is hell, but to each their own.

I only believe in dying and going to one of two places Heaven or Hell. I don't believe in reincarnation...

I believe something does happen to our spirits after we die.
Whether it's reincarnation, Heaven, Hell, purgatory, etc...we can't actually know until we actually die, right?
So quit riddling your brain with this and live life to the fullest at the moment. You're not dead yet. What happens, happens.