Here are the answers to your questions:
1. What is a paragraph?
A paragraph is a group of sentences which develop one central idea.
2. What is the proper "punctuation" for a paragraph?
The proper "punctuation" for a paragraph is indentation.
3. How long should a paragraph be?
Most paragraphs have more than three sentences in them and usually have between one hundred and two hundred words.
3. What should a writer always try to do to his topic in a topic sentence?
A writer should always try to make a statement about his topic which limits it to a certain extent.
4. What are eight kinds of "controlling words or phrases" that can be