Your manuscript has to be accepted by a publisher willing to publish it, otherwise, you need to do it yourself, its can be expensive, you take the risk though and keep all the profits.
However you wont be able to sell as much as a publisher because, imagine having to hawk your book to every bookshop, or maybe could only do it on amazon, but thats only if you content to do print on demand or kindle editions. Which is not REALLY a book IMHO.
I dont want to read a book I have to print out on paper for myself I dont have a printer or the equipment to do that, nor a kindle.