How much should I charge for a photoshoot?

So I took photography classes for two years at my high school (because that's all that was allowed) and was a part of the school yearbook. I have knowledge of DSLRs and I always shoot on manual or anything except auto. I also have knowledge of techniques like rule of thirds, depth of field, so I know my way around a camera pretty well.
I've just recently decided to start my own photography business, but I'm still really unsure of what to charge.
I have a Nikon D3000, a zoom lens (not telephoto), and a 24" 5-in-1 reflector.

My website is www.cjostphoto.weebly.com so you can get a better idea of my shooting style and quality of shooting… Any help is appreciated! Thank you!

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