I map but from scratch so i dont know if i could help, i only know very small amounts about map modding with mods and stuff from my time working under boy,but im gonna go learn some more stuff over the next few weeks that im sure will be handy >: D!
as for the text thing its a target_print which you give the same name as whatever your triggering is one way to do it
Trigger> func_door + target_print
you give the func_door + target_print the key targetname and the value of something like Dooropenanncouncement
but as i said i worked with boy so twimod is different from ds online or whatever you guys use
but i dont know how you make these ingame i use gtk and jk2 radiant
but yeah hope i helped sort of?