I'm having a huge problem figuring out how to edit sentences that start out as a statement but then end with a question or questions. Please help!!!

 For instance:

--The question is: What compliments green?, or, in other words, What color is across from green on the color wheel?

Do I put single or double quotation marks around the questions, and how should "or in other words" be puncuated?

--The first of these issues, examined in chapter 1, involves answering the questions: What is microbiology? and How can we use it?

How should this be punctuated?

--Other questions will also be answered, such as: What is split complimentary? How can we use it? What is the best way to choose paint colors?

Quotation marks, no quotations, commas?

Sorry, I always have to know the reasons behind things. Why do I put quotes around the first sentence and not the others? And, when do you use single quotes? Around words when being sarcastic, or is it still double quotes?

 Thanks for your help.