Ive only played a few games and seen the movies as well, but as I understand it, Luke did end up rebuilding the Jedi order. I guess all of a sudden people started popping up that were force sensitive.... or maybe palpatine was just killing them off, idk. All I know is that the Jedi order WAS rebuilt, and that it was more lax then the previous one. i.e. I believe the restriction on love and relationships was lifted, or at least partially lifted
some like mara jade were former dark acolytes while others like kyle katarn never knew they were.
as the restriction on love and relationships it was completely removed since that was what technically destroyed the last order.