Thanks for the help, I am getting it sorted out a bit I guess...
I see that there is the "receive coins" tab, and this is the number/account (what do you call this?

) I share if I want to GET coins.
Mine is : 1QCvEe6xU6Dsh83bxEaEsh8ftGnoqUvgoH
now, if I want to send coins , there is a place for me to enter a number there too (who ever I am sending too)....
However, I get confused as soon as I start to think about my "account"
Do I have a account number, . or just send and receive address?
There is a back up option, it makes a "DAT" file, is that the file I need to keep track of.
I am sorry, for noob questions, but just fighting with terms and some of the concepts.
THANKS YOU for all the help, it is really appreciated
It has more information than you need to work with bitcoin-qt, but it should give you pretty good information how things work under the hood.