yes you can.
rather than procrastinate, just do it.
Whenever you start a new sentence, you start it with a capital letter. I know it sounds strange, but this usage is rather common.
You could, but this would be incorrect grammatically. Rather, you should write "Attached is a copy of your request."
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."
i rather you go on a bike
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.
I would rather not have to answer that question.
"Rather" can function as an adverb, conjunction, or determiner in a sentence.