So what exactly is a Sentinel...?
A Sentinel is a person who is caught in a stasis where they are neither in Heaven or Hell, but rather showing purity and humbleness of heart by protecting souls traveling to Heaven. Not everyone becomes a Sentinel when they die, rather you're chosen by the Master Designer. The act of becoming a Sentinel is when you are paired with a Star.
Do they have super powers?
No, not exactly. Sentinels are like you and me... except they're dead. Just by dying, they don't inherit some kick-butt powers, but their physical infirmities (i.e. broken arm, wheelchair bound, deaf...) are replaced with a fully functioning body. The most they will get is an extra 'glow' ;)
What is a Star?
You answered your question there: a Star is a star. From Earth they look like pinpoints of light, but up close they look like humans... just really tall and they glow constantly. When a new Sentinel is transferred to this stasis-type place, a star is paired with them and they become a team. [This is confusing, I know]
What can Stars do?
Based on what Star has chosen you, that is where your power will lie. The first 9 stars are going to be the most powerful [not counting the Sun], 10-18 are the second most powerful, and the remaining stars are lesser in stature and power. Here's the link I used to look up the stars according to brightness. The Stars gain power from the light surrounding them and can manipulate it to produce anything from a sword to a flower. Those beyond 18 will have trouble generating anything more dangerous than a dagger.
What are Sentinels supposed to do and what do the Stars have to do with it?
As mentioned in the last question, Sentinels (which means guardians) are paired with Stars to make sure people crossing to Heaven actually make it. There are shadows and dark entities who are raging along the lines of empty space and they try to tear people off the path. It is the job of the sentinel and star to protect everyone that crosses.
Where does this take place? This isn't Heaven?
Nope! It's not Heaven and most of the interactions will begin in the Transitional Road, which is the link between the Sentinel's world and Heaven. Sentinel's do not cross this road, but they are stationed along it to protect those passing through to 'the other side'.
[---------------------]
Still confused?
If you're having trouble understanding anything in here or just curious about the club, PM me! I don't bite, I promise~