Hi Doberman,
If I understand well, you want Daphne to start automatically when you boot your computer?
If so, there is an option in Daphne to show the 'command line' used to run the game following the options selected in the Daphne GUI. Just check that option, copy/paste that full command line into the autoexec.bat file and there it is.
To hide the windows XP boot screen, just google 'Disable the Windows XP Startup Screen', there are few solutions to do that:::
Do not hesitate to post pictures of your project, and a short introduction about yourself