From what level was best to start?

Back in vanilla, from what level was best to start?
Becuase if you are 3-5 in a party you get less exp and leveling would take longer.

Alright, so after your first thread about private servers was deleted you decided to make a second, more general, one which asks about an era from almost a decade ago. The only people interested in that era are those who are stuck in the past (like myself) or those who are playing on private servers and want help with them (like yourself).

You will find no support for private servers on this site and I recommend that you not start another thread pertaining to them.