Yes, but the sentence may not sound so great...
yes you can whoever asked that question and thats a great way to start a sentence in perswasve writting.
Yes. 'Who took my sandwich?' is a great example of a sentence in the form of a question.
You can, but traditionally coordinating conjunctions (such as and, but, or) are not used to start a sentence. You might consider using "alternatively" instead. For more synonyms of "or" consult a thesaurus or dictionary.
No, you cannot start a sentence with "no" unless you need to do so. No reason exists not to start a sentence with that word, as you can see. No one will care if you do start a sentence with it.
Yes, I can start a sentence with "Is."
Around six o'clock, I'll have a great answer for you. Around the fort, our cordon was impenetrable.
Yes, you can start a sentence with a verb.
Yes, you can start a sentence with an acronym.
You can start a sentence with "Also"
You start a sentence with whatever word you need to start it with. A sentence can start with "A" if it needs to. A sentence just needs to make sense.
"They both have great humor" is a sentence.
That depends on what your paragraph is about! Just start writing, and when you're totally finished, go back and make up a great first sentence for your work based on what you wrote.