To get the job to run in the background (and return a prompt) do:
./agent.be &
Now if you quit the terminal the process should stay running. You can verify by opening a new terminal and:
ps -ax | grep agent.be
As to having it run automatically at boot time, did you try rebooting the server after installation? The
Q&A on this site seem to suggest that (see questions 3,4,5).