Prewriting is just getting all of your ideas on paper. Make sure the reader knows how it supports the topic sentence. The short recap is probably a sentence explaining what this paragraph said. Once again you'll need to smoothly flow into the next paragraph.
Sometimes a tie in can be hard to think of, but if you do it can pay off big time. Here's an example of someone who doesn't keep in the same tense.
This is where your essay gets that nice feeling because it starts in a similar way it ends.
Also multiple sentence theme statements are possible, but can mucky up the point. It's important that the attention getter has some relation to the rest of your essay. The Thesis Usually a sentence or two you need to state your thesis. There's not much advice to give you on transitions except that you need to connect your paragraphs together.