I have never used a gallery service. So all this is new to me. Can someone give an example. Starting with how you price your piece. And do you adjust price based on the location of sale? Is there a book that covers this in detail?
You should go to the library and check out books on how to run a small business. Basics are basics no matter what you are selling.
These books will teach you how to calculate your costs so you are not loosing money faster than you can make things.
In wholesale you mostly cannot control the price a Gallery will charge for your work.
You sell to everyone at the same price. They mark it up to cover their expenses.
So someone paying big bucks for a high traffic location will likely charge more than someone with low rents and costs.
You can set a minimum price they can sell it for.
You can offer to buy it back rather than let it go on sale.
You can negotiate designer/decorator discounts.
Consignment is a whole different thing BUT these days consignment Galleries want 50% too ... so you are basically stocking their shelves at your expense and taking ALL the risks too.