[CentOS] systemd startup on centos 7

Ok I created my script this morning

[Unit]
Description=Connections
After=network.target

[Service]
Type=notify
ExecStart=/home/silentm/bin/mystart

[Install]
WantedBy=multi-user.target

I put it in the correct directory, I rebooted and I see that
my mystart script runs- programs start up but then
they are killed with signal 15...

Is there something else that allows them to continue to run?
the mystart runs the needed programs then it does exit.
I presume that mystart exit is killing the children.

Whats the magic to let the children continue.?

Thanks


Jerry