You can publish for almost nothing straight to Amazon.
If you want to publish a top-quality, edited and professional novel, you'd need to seek the services of an excellent Editor and / or proofreader, someone to format your book, a graphic designer to create the cover and then, if you wish to have a print version (hard or paperback) you'll also need the cost for printing.
There are plenty of webpages with advice.
My best advice is to have your book edited to the highest quality it can be.
thanks maam!! bcoz publishing here in the ph costs a lot of money