Image preparation for website build (ongoing)

I require a number of images to be prepared before they can be loaded (by us) onto a CMS system for an online retailer. The products are furniture and homewares such as sofas, dining tables. They currently come from different sources so have non complimentary backgrounds, we therefore wish to remove all backgrounds. The work required: 1. Remove the background from the image so it sits on a transparent background, add natural shading 2. We also wish to reflect different colour chooices for each product, such as material colour for sofa, wood colour for dining table so for each image once the background has been removed we would like different versions created to reflect how the product would look with the different colour choices. Please quote therefore for: 1. To carry out the above work on 25 images assuming an average of 4 colour/material variants for each 2. An hourly rate for future work (such as banners)