Okay, so you've got pictures. Now i'm not going to say anything about the pictures as such - if you're using online marketing techniques, there are some two billion people out there all of whom have different tastes.
There should be enough of them for you to make a business through selling your pictures.
Actually, it could be that by the time you've set up in business, you'll have found other and better ideas - only you like photography and we'll start there.
My advice is to set up your website. It need not cost the earth. Choosing a name for your website is far more important. Either do this through Wordpress or weebly or whatever, if you go for your own hosting you can install the wordpress platform and work on from there. You can get really cool templates from Arcsin. Wordpress is pretty straightforward, and as long as you treat the "experts" with care, they might deign to help you with technical problems.
The hard bit is engaging, and you've crossed the first hurdle with your photos. Even more important is finding out what they like (and don't like) about your photographs. You can do this online through twitter, pinterest and facebook.
Don't forget to have a newsletter for those who really like what you do. Mailchimp has a free service for this which will do you nicely.
It's all a bit of a learning curve, only remember that you've already got your niche. It will take time, and you will make mistakes. You will learn, and you will learn what sells and what doesn't. Learning what does means you have a business. The other stuff is art (and can command far higher prices!!)
Hope this helps.