Need help with calming my puppy for marker training not be distracted or hyper

Puppy age: 11 January 2026 German Shepherd Had it 4 days ago

His name is Max, currently I have been trying to set boundaries limit and rule and some basic easy training like marker training only as of today (not working at all eitherhe doesn'tunderstand it or distracted whenever i click he doesn't look at me or react). However he is so distracted would run around a lot go to places I don't want him to go i have tried in an empty room with a leash but he only resist and stay still or bite when I have the leash on so I stop using the leash but he is constantly going away from me roaming around biting me doesn't seem to understand what I am trying to convey been watching tons of YouTube video from kikkopup, Zak, ceaser millan, etc. Nothing seems to work. I can only hold treats to is nose but all it does is makes him excited lunges and at me thou there's are some times where he does automatically sit for awhile I would wait just like 5 sec but he would either lunges or bite my leg cause he thinks is a toy and wherever I move he follows unless distracted by a shoe or item or a certain. I just want some advice on how to calm him down and focus on me and no lunges and understand his marker and training. He is a puppy afterall I get it that he wants to play and all but I am wondering am I doing something wrong or I shouldn't train now should I wait 3 more months or what..need some help please