Was not planning on going, but we are now interested in going to Wimbledon tomorrow (opening day) or Tuesday. Last minute and obviously we will need to queue - do we need to be there by ~5am? I know people camp out...

If we do get there around 5/6am, what time can we expect to actually enter the grounds? Only interested in grounds passes, not court 1 tickets.
Also, is the tube the easiest and best way to get out there from London (Chelsea/Kensington area).