Here are some instructions for knitting flat on circular needles.
http://techknitting.blogspot.com/200...rth-round.html
It sounds like you are knitting around and around. You need to knit across your stitches, turn your work (i.e. switch your right needle to your left hand and your left needle to your right hand) and knit (or purl) across.
You will alternate between working the front, then the back, then the front.
Hopefully the pictures/instructions in the above link will help.
I'm sorry for all the work you'll have to undo.

Edited to Add:
Think of it like knitting with straight needles. When you are finished a row, all your stitches will be on your right needle, and your left needle is empty. To work the next row, you switch hands (right needle goes to left hand, left needle goes to right hand). Same with circular. Just pretend they're not attached.