Its great to see your trying to get a fast head start, and thats the spirit, but i don't think you're quite ready to sell models from what i've seen. By no means am i saying i am either, but i too am working on it.
I mean, hard part is not really modeling. Thats the fun part, the hard part is texturing and animating. Thats what people want, they don't want just a bland model. I think you should give yourself more practice and time, but however it goes for ya, good luck
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im not saying modelling is easy, im just saying, it doesnt seal the deal