Linux frustration

Ok so I'm not trying to do anything radical. At least I don't think so.
I did some work for some one, and now I want to use GnuCash to send
them a bill for it. So I started up GnuCash, I figure its a good way to
keep the money in order, and I set up an account and get ready to write
out a bill for 2000 NIS. I for the life of me can't figure out how to
send a simple bill to my customer. I can I guess just send him a bill
with pen and paper, and I'm thinking at this point it will take me less
time.



I also have noticed that the user interface in gnucash sucks, for one
thing the help doesn't. When I open it up it makes the window tiny so
you can't see anything and half off screen. So before I get to the help
I have to move and resize the window, then spend 10 minutes trying to
find out how to do what I need, and when I find it its not helpful.



When I gave up and tried to quit it asks me if I want to save but gives
me no clue as to what type of file(s) I should save in. What is the
standard extention for gnucash? I sure as hell don't know.



I also need an application to track my hours, something that I can feed into gnucash would be nice