Put an autostart script into /etc/init.d, for example startme:

#! /bin/bash
Start the application here

Then run the following command to setup the autostart in the different runlevels:

update-rc.d startme defaults

You can check existing entries with the following command:

ls -l /etc/rc?.d/*startme

To remove the autostart:

update-rc.d [-n] [-f] startme remove

-n: no action, just show what would happen. -f: force removal even if vmachine.sh still exists