How can I make a rectangular box based on the dimensions that I need?

I'm organizing my room, so I'm trying to make the most of the space I have. I'm trying to figure out how to make a rectangular paper box with the dimensions that I need via the origami folding method.

How can I customize it to the dimensions that I need so that I can then do the origami method for making a box?

Update:

I forgot to mention that I did follow this: http://www.homemade-gifts-made-easy.com/origami-gi...

It was very helpful. However, when I started to fold my paper everything went awry.

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