Some quick commands to consider are:
help: Bring up a list of commands that are available from FTP. After
bringing up the list, you can type "help [command]" to see more
info on that command.
binary: Will insure that your files are being transferred in binary mode.
This will insure the integrity of binary files that you're
transferring.
put [filename]: Will put the [filename] from your PC to your webspace.
get [filename]: Will put the [filename] from your webspace to your PC.