This text is perfect, it is published in 1922 and so it is clearly public domain

To prepare, count how many chapters there are and if they have a good length. If a chapter us too long for you to read as one file, you may have to split it in two, and if chapters are very short, you can choose to read two or three in one audio file. You also have to come up with a description for in the catalog. But thats basically it

Read the instructions here on how to get started viewtopic.php?f=28&t=13513
And see already this indormation on the magic window https://wiki.librivox.org/index.php?title=Soloists:_How_to_update_the_Magic_Window
As a soloist, you will fill in and update the magic window yourself - but it is very easy so dont worry!
Let us know if you have any questions!