A pair doubts at scriptin interface to irssi

Hi to all,

I'm doing one script to run one "new" command again one rest api and
publish results in a channel, and i have a couple of doubts to
resolve,
somebody can help to me ?

First doubt is about level of messages, i don't mean the LEVEL
argument at print function. whats mean LEVEL ?
I wish to publish some information at channel with my nickname, is it
possible with "$witem->print" function or i need to use a "msg"
command ?

The last doubt is around "help" command, how can i set help about new
command ? there are other functions like
command_set_options or command_parse_options, but i didn't find any
function to do this action ? may be with a signal ?

Thks a lot.
--pau