Here’s some advice from an old gamer regarding etiquette:

Homebrew settings are a TON of work. If you have it within you as a narrator to put in all of this work, AND your players are the sort of people who would recognize and appreciate it, AND they will keep attending your game long enough to enjoy the fruits of all your world building, then you are one of a lucky few.

There is no shame in boxed settings. Being contemptuous of boxed settings is toxically egocentric. The people at your table will not remember your game because of how self-made it was. They will remember how much fun they had. You also don’t need to show off by being “super creative” all the time. Rejecting ALL fantasy stereotypes in an effort to impress your players usually comes across as insecure or wacky. The stereotypes exist for a reason, and that reason is they are great fun when done right.

A narrator's job is to entertain. That means challenging your players and telling an interesting story so that THEY leave the table satisfied. To do this you must put your ego aside. Do not develop an adversarial relationship with your players, railroad them, punish their creativity, or inflict unnecessary hardship. 

Players have an obligation to the narrator. That means recognizing and accepting plot hooks, taking notes, paying attention to what’s going on in the game, not being an obnoxious rules lawyer, and not chatting or making jokes while the storyteller is trying to set up a scene. It also means refraining from chaotic, petulant, or violent acts that will obviously derail the plot. Being a good narrator takes a lot of work, and it is often a thankless task. Players who don’t respect this effort do not deserve to be entertained. 

Players have an obligation to one another. This means letting each character fulfill their “role” on the team without being overshadowed or marginalized. It also means sharing the spotlight, encouraging the quiet people to participate, not checking out on your phone, paying attention to what’s going on, taking notes, keeping track of treasures and resources, encouraging good roleplay, behaving respectfully, demonstrating teamwork, and not hogging all the pizza. If you can do all of these things then congratulations: you are a perfect player. 

Also, if you are a shy player and don’t intend to do a lot of talking at the table, please don’t pick a high charisma character and then try to play the “face” of the party. If the other players at the table are loud and overbearing, and they are playing low charisma characters, you probably won’t be happy in the long run.