starting a linux script in deamon mode and terminating when requried

I need to start a linux script in a background in deamon mode and then kill it when requried. To that end I try the following

script.sh -daemon -p zpid

What I'm confused about the above is,

• What is the -daemon flag, I assume this says to start the process as a daemon. Is this the same as using -d ?
• What does the -p zpid part do ? I assume it assigns the processID to the zpid variable ?
• How do I kill the process?

The -d represent the daemon and the -p is for naming the process id then you can use that name to find the process and stop it with this command ps aux | grep -i zipid

But I think its better to use screen or tmux as you can also see the output as well.