Help!

So I was thinking of writing a smut+romance novel(+40k words). I have the idea, the base, and the overall plot prepared. And I think, given my craze for smut, I can write it within three weeks.

What I want to ask my readers is where should I publish it. I have been researching like crazy since yesterday and found many advice to self-publish on Amazon. And since I won't be writing non/con and taboo, it will work there.

However, some said that marketing is required on Amazon and whatnot, for which I don't have anyone to help. I am flatly broke and trying to make some money out of this so I cannot hire an advertiser or editor.

I can write a fairly good novel given it would focus on two people but unsure where to post it. I heard Smash Words is good as well but again I am totally new into this. So please suggest me.