What is unique about a provisional patent application is that it is rather easy compared to a full patent application. You will not need to provide an in depth report on the inventions objectives, benefits, or a discussion on the prior arts that may precede it. You also do not need to have any claims at this time. This is the difficult part of getting your permanent patent.
The description of your invention should include a title of it, the purpose of the invention, a description that fits with each drawing that is provided, a components list and steps of the invention requirements, as well as how the steps happen as seen on this channel – https://www.youtube.com/user/inventhelp.
You will need to describe how the components work and what the best mode of the invention is. You may also want to mention the alternative ways for the invention to reach the results of it and any advantages that the invention provides to the user.
There is no need to spend countless hours working on a provisional patent, but getting it is the jump start to getting your full patent. You have just one year from the time that you obtain the provisional patent to obtain your permanent one, and the permanent application is much more thorough itself as explained on https://www.tmcnet.com/topics/articles/2020/03/24/444881-everything-need-know-inventhelp.htm.
The good news is that an attorney can help you through the entire process, making it far easier to obtain the provisional patent you need. On the other hand, to save money, you may be able to do this part yourself.