Rule number 1 that you will hear over and over, do not copy an acd phone. This can cause corruption that sometimes does not rear its ugly head until well past the copy.
And to be perfectly honest, if you just inherited a new switch, and you are not that familiar with Nortel, the best way for at least a little while to get a basic grasp on how stuff is programmed is to print out an existing phone, and then build a new one line by line, using your print as a guide. This way if you get an err message you can look into why you are getting it.
Other than that ld 20
cpy 1
2xxx (2008, 2616 etc)
TN the TN you are copying
TOTN to what ever new tn you want the phone on
DN the ext of the new phone
enter
Then ld 20
chg
2xxx
TN of new phone
echg yes
Key 1 scr new secondary dn of phone