Pattiann is right, enlargement is limited to say the least. The 8 x 10 size requires a very large hoop too.
It might be more effective to have a design digitized an embroidered by a professional digitizer. If you are a member of ATG's Club, there is a digitizing service availble. Go to the Club area and check for it there.
You don't mention how long you have been embroidering nor the size of machine you have, so some things are unknown in your question. Read some of the blogs and use the search function in the Forums. We are all learning, regardless of of our experiences.
Pat
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If you want to see my pashminas (that I successfully sell retail) check them out here. I also wholesale them.