Never work for free. The reasons are many, including:
Clients not willing to pay for design will have no respect for you or design.
On the other hand, you could get skewed customer experience information.
You are undercutting other professionals and by the way, those other pros are where a big piece of your business will come from as a small shop.
You won't know how much to charge your first client. You'll probably charge too little.
