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As for conversions to sales. There are many factors involved, ranging from : is the product you are selling priced correctly, to how easy is it to use your site.
If you haven't already done so, search the forums for 'conversion' you'll find plenty of useful information and discussions.
A more important measure for you to look at would be the COST PER CONVERSION or CPC, what is the total you spend on click throughs for one conversion to a sale? Taking into account the profit you make when you sell a product. If you have 10 clicks at 50 cents and 1 conversion, that conversion would have cost $5 if you make less profit from the sale of the product, then that's not too good.
Incidentally you will find that % click throughs and conversions can be suprisingly low figures and still be good.
Good Luck