Hi,
When you want to introduce a new idea in a paragraph, you always need to conclude the idea/subject you were previously discussing. To do that, just put down your final thoughts and then close it up with a period. Usually when beginning a new idea, you can leave an indent like this:
You would start a new thought by explaining first what your topic is. To learn more about Outlines, visit BrainPOP and watch their video about Outlines.
- I hope this was helpful for you! :D