It is probably best to write for the love of writing. A very
small number of writers get 90 % of the pie; the rest are lucky to get a tiny fraction
of a crumb.
my name is Janet I am new here and would like to know if you make money buy using this site selling your books and how it works. I am writing a book
I does not really matter which site you use, the odds are usually the same, but at least using Lulu it is free to publish yourself and to be distributed to many sites where people have the opportunity to buy your book, and as many here have said, it's doubtful you will make any serious money, it's a while before even writers who become famous can afford to give up their 'day' jobs.
But for now, just write because you want and enjoy to, not with sales in mind.