How to use meg
In the middle of a sentence, meg is usually a conjunction or a function word used to introduce a clause, in the same way that "that" or "which" or "who" (or "what" in some dialects) is used. Example: Ni haa'tayli verd meg miit'gana. I see the warrior who writes.
The word meg can also be used as a pronoun that functions in the same way English uses "what." This is often harder to determine in the middle of a sentence, but that is the word's meaning when meg begins a sentence. In most cases, when meg begins a sentence, it indicates that the person is asking a question. In rare instances, it starts a statement. If you think the meaning of your sentence will be otherwise unclear, use ibac meg when you want to make clear that you mean "that which" or "what" as a pronoun. Use tion'meg when you want to make sure that your audience/listener knows that you're asking a question. Examples: Vor'e par meg gar vaabi. Thanks for what you do. Meg sirbu? What do you say?
Despite its suggested use in front of words that begin with vowels, megin is never used by the author in the source material, even when the word following it begins with a vowel. Most people follow the author's example and simply ignore megin. However, some people may choose use it in front of hard consonants, such as g, k, or hard c, repurposing this word to make sure such sounds don't disappear and cause a confusion in the meaning of the sentence.
Other people choose to reduce meg to me' before consonants, if doing so would not cause confusion with meh (if). Whether you choose to reduce meg to me' depends on the preferences of the group that you're with and how clear you want to be. In other words, when in doubt, do not use it outside of the set phrases. In any case, do not shorten meg to me' in front of words that already begin with me'.