What method you use to come out to family, friends, etc. is up to you.
You could use a letter, have a talk, make them a gift, call them, or any number of other ways. There is no wrong inherently wrong way to do this as long as basic respect is involved (assuming they’ve earned it).
There have always been many forms of communication and all have different uses.
What’s important is the method that works for you and those you are trying to come out to.