If you’ve got some material you feel strongly about why not get out in the community and share your thots. Without quite a bit of rehearsal you may end up boring people. Because some readers feel uncomfortable in front of an audience at first, they might look down at their writing too much. They may forget to smile occasionally. Practicing at home in a strong voice helps overcome this handicap. Pretend you are looking one of your imaginary audience members in the eye for 2 seconds.
Use a timer to rehearse. It is good to write down the exact amount of minutes and seconds each piece takes to perform live. Every time you time it it will be slightly different. Take an average. At some readings you will have a specified time to read. Perhaps 10 minutes. Here is an online Time site you can use to time your reading. Allow for the time it takes to go to the next poem or prose piece. If you wish to introduce a poem or say a few words about yourself, this should be part of your presentation time. Allow 1-2 minutes in a 10 minute reading, for this.
Here is an online timer for you to use when practicing your written work for public readings:
Online-Stopwatch
You can also time your eggs with it.