Do You Use Myself First?

Idiomatically, people probably use me or myself more often than I there - but if they do use I, it's nearly always in the final position (whereas me tends to come first, and myself works fine in either position).

Is it correct to say myself and John?

No, the phrase “myself and John” is absolutely incorrect. Especially when we are talking about the person speaking as a subject, the use of myself as their personal pronoun is nothing but a false choice.

What is the correct way to use myself?

While "myself" and "me" are both objects, "myself" is what is called a special object. You should use "myself" and not "me" as the object, only when you are the subject of the sentence. Example: I could not dress myself. Correct: You are asked to contact the provost or me.