I would always use a chessex mat with the grid on it. That way I can easly give players an areas layout. Also, if you know for sure what they would encounter in those areas have miniature, counters or something to represent them as closely as possible. I would suggest a cheat sheet with the players basic stats on it; AC HP and things like that.
1-1-1 Dark Eldar
2 - 3 Dark Elves
"Fairy tales do not tell children the dragons exist.
Children already know that dragons exist.
Fairy tales tell children the dragons can be killed."