Hi, there is a company in Santa Ana, Ca called the Artbar. www.artbar.com
and they do something similar to what you are interested in doing. instead of being out of the owner's basement they are are out of a gallery basement but they charge for time and unreusable materiels (i.e. paints) by the hour and "shot". They then also have hundreds of stamps, scraps of papers, inks, rolls of papers, fabric swatches and most importantly space to work.
This may be something you should look at to get an idea of how they use the materials and the services they offer. the owner is very nice and since you don't live in CA may be willing to answer some questions.
hope this helps!