Check current status of rsyslog

$ chkconfig --list rsyslog
rsyslog                   0:off  1:off  2:off  3:off  4:off  5:off  6:off

Start up rsyslog at some levels

$ sudo chkconfig --level 35 rsyslog on 

It outputs these information:

insserv: warning: script 'plymouth-stop' missing LSB tags and overrides
insserv: Default-Start undefined, assuming empty start runlevel(s) for script `plymouth-stop'
insserv: Default-Stop  undefined, assuming empty stop  runlevel(s) for script `plymouth-stop'
The script you are attempting to invoke has been converted to an Upstart
job, but lsb-header is not supported for Upstart jobs.
insserv: warning: script 'failsafe-x' missing LSB tags and overrides
insserv: Default-Start undefined, assuming empty start runlevel(s) for script `failsafe-x'
insserv: Default-Stop  undefined, assuming empty stop  runlevel(s) for script `failsafe-x'
The script you are attempting to invoke has been converted to an Upstart
job, but lsb-header is not supported for Upstart jobs.
insserv: warning: script 'udevtrigger' missing LSB tags and overrides
insserv: Default-Start undefined, assuming empty start runlevel(s) for script `udevtrigger'

Check current status of rsyslog again

$ chkconfig --list rsyslog
rsyslog                   0:off  1:off  2:off  3:off  4:off  5:off  6:off

I am a novice. Please show me how to use rsyslog from beginning.