Here are the correct versions of the sentences you asked about: 

Do all editors use the same English language and punctuation guidelines? 

What instructions are essential to give to the English language editor?

If you submit a one page, 300 word document to 10 different English language editors, you will receive 10 different edited versions. 

What are the grammatical rules associated with using bullet points?

If the text that follows the bullet point is not a complete sentence, it doesn't need to begin with a capital letter and shouldn't end with a full stop. 

A bullet point can be one word, a list of word, or a term (combination of words). Here is an example: Weather forecasting