
These stars are all main sequence, not very luminous stars. They are all relatively similar to our Sun.
Even with 1000 stars, you'll notice how large is the Andromeda galaxy !

On average, the distance between adjacent stars defined in this file is approximately 4000 LY ! M31 is really HUGE !
You can start adding planets, and civilisations around these stars.
Have fun !
EDIT : Here's a small CELX script file to mark all the above 1000 stars, to help seeing them and navigate in Celestia. It's using a small sentence in French, and it's very easy to edit in your language.