man this was tough to watch knowing it was the end. I will break this down to outline (more or less)

1) Halo and Athena's daughter Hera is saved after an all out blitz on the Cylons main outpost
2)The Final Five connect Anders (cylon model 3) to the Galactica's main frame to interfere with 'evil cylons' communication during the assault
3)After the battle is over, Starbuck programs co-ordinates based on musical notes which been haunting her since her return (every button on a phone has a distinct tone) in to the FTL and the remaining ships 'jump' to a new planet where the the Galactica's structure all but collapses and is now useless.
4) The new planet is EARTH-OUR EARTH!!! but there is a catch)
5) Once on the planet, they discover a primitive species of man and begin moving the remaining colonists to the surface, they landed in Africa.
6) Once on the surface, it is like the final episode of MASH where every one goes their separate ways. Adama takes Rosalyn for a ride in a Raptor to see the new planet where she finally succumbs to cancer and dies.
7)Starbuck and Apollo are talking about their plans when Starbuck disappears, she never actually returned, she was nothing more than a ghost.
8,)Flash forward ahead 150,000 years where scientists have discovered the skeletal remains of Halo, Athena and Hera (still a child, assuming an asteroid hit the Earth wiping them all out) and has been classified as Mitochondrial Eve

The events in this series take place 150,000 years ago