How do I make money on the photography (fine art) website I'm starting soon?

I love photography, and I’m finally starting to build up a portfolio.

I also want to make money as a photographer to supplement my paltry work-study income, and have found someone to build a website for me.

I obviously have to pay my web designer and for the space- but how do I make that investment worthwhile? Or, how do I make money off of it?

How do I market my website? How do I decide what my work is worth? How do I protect my photos from being stolen?

Thank you to anyone who can offer ideas and wisdom.