Hello guys, sorry it took soo long for me to respond, i hope i still can help someone by writing it down now. So this is how i did it. I created some firewall rules to allow the connections i wanted to pass, and doing so logged DHCP requests and leases with the timestamps, for questions of readability and/or time saving issues, i forwarded this logs to a remote server using rsyslog, you can do this by enabling remote loging on pfSense. On the rsyslog machine i configured graylog to get inputs from rsyslog and pfSense extractors with regex, to filter out the information i really wanted without the overhead of information, than correlating information and i got what i wanted.
NOTE: This is the way i did it, im still a noob so maybe there is some new ways or other ways to do this faster/better.
Take care.