AH does have online help accessed through the 'HELP" button on your clipboard.
AH also has a manual, available from their download page, that has a TON of very useful information on the game, setups, keyboard and dot commands, etc etc.
It is relatively small file, about 5Mb, and can be used offline and has a searchable database.
I highly recommend it to any new players and it can give you a good start and solid foundation to work from.
I been flying AH just under a year, with other sim experience before that, and I still refer to it occasionally.
fuzeman