ok the alias, but first...

on *:text:!help !pass:*:{ if (%s != on) { sendhelp $nick 21 21 | set -su20 %s on } }
When someone says "!help !pass" u want to msg them line 21 of the file IF %s is not "on", so i check %s not = to "on" and if so, then i call my alias passing it who to send to in $1, starting line to send in $2, ending line in $3, aka "$nick 21 21", then i set %s to "on" with the auto unset option in 20 seconds.
So now u know what the event does, but more specificly what my alias is ment to do.

Code:
alias -l sendhelp { 
  var %i = $2
  while (%i <= $3) {
    msg $1 $read(help.txt,n,%i)
    inc %i
  }
}

The -l stops something else calling sendhelp besides your events, liekly not needed but who knows.
ok I set %i to the starting line to send
i then start a while loop that keeps going whilel %i is less or = to the ending line, in that loop, i send $1 (the $nick) said %i line from the file, then add one to %i, it then repeats untill %i is greater than the ending line (which happens to be the starting line also in !pass)

The second option i gave you, you must reformat the help.txt file, its still text, but u need section headers in [ ], then u can use the /play command to just play (msg) all the lines in that section to the $nick
the file might look like this...
[help]
this is my help on my bot there are a buch of commands it can do.
you can get help on each of them by doing
!help !qme
!help !say
!help !die
[!qme]
The !qme command well it doesnt work on tuesdays
Unless your blonde and good looking and interested in me.
[!die]
The !die command makes you drop dead right there at your pc.
[!say]
The !say command well it doesnt say much right now
[!bobthemagicdragon]
The command makes bob the dragon appear, ps hes magic

doing a " /play -t!qme $nick help.txt 0 " well play (msg) $nick the following 2 lines.....
The !qme command well it doesnt work on tuesdays
Unless your blonde and good looking and interested in me.

becuase they were under the heading !qme the bit follwoing the -t

For more help on /play, just type /HELP /PLAY in mirc.