Help with Packet Sniffing

I would suggest that whenever you want to locate a specific packet you do the "talking" approach. Each time you are about to do something, write something before (like typing in the console "start" and press enter), do what you want next and write something after (Like typing in the console "end" and press enter).
After that, locate the packets that contain the words "start" and "end", once they are found, the packets that you want are between those 2. The rest I still dont know how to work with.