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 e.g. table pic attached. Also remove items if possible such as the vodka bottles!
2. We also wish to reflect different colour choices 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. e.g. change wood colour and sofa material colour in sofa pic attached

Please quote therefore for:
1. To remove the background, add shadowing, and change the texture on 20 images
2. An hourly rate for other work