First things first, it might be worth checking if there is a specific lesson plan format that you need to follow. Some schools, colleges and universities have a standardised format to follow as this makes it easier for another teacher to use if you are unexpectedly away from work. While there are many different formats you can use for a lesson plan, most contain the same core elements. The title and time of the lesson are basic pieces of information and a list of required materials ensures no essentials are missed out.
A list of objectives can help you to gauge whether or not your students have achieved everything they should have once the lesson is over. Depending on the subject matter, objectives might be practical, for example, what can the student do at lesson completion. The objectives could also be knowledge based, for example, what does the student know after the lesson is complete.