OsCommerce Adjustments

I've bought a template theme from Themeforest (owen shop) and am not getting any help from the designer .... ..Anyway, i need to * implement a minimum quantity that can be altered for different products ..so some products might be min quantity order of 6, some may be 2 and so on. * allow an image to be placed on each of the Category and Manufacturer pages (for some reason at the moment this can't be done on this theme) * fix up alignment of products. (when there is one product displayed for a category, the image needs to be aligned left, but for some reason it floats in the middle) The shopping cart is oscommerce 2.3.1 ... I've seen contributions to solve the min quantity but they seem to be for earlier oc versions and I haven't got experience to experiment .... Thanks!