I want my blog to have say 5 or 10 post, but only have a few sentences in each post then have a (read more)
No need for a plugin, this is built in.
In each post, put a <!--more--> tag in where you want it to display the Read More text. On the main page, it will stop showing the post there and will display the link instead. On the single post page, it doesn’t stop there and continues to the rest of the post.