food poroducts consignment letter and terms.. how and what should it contain?

Philippines
April 5, 2011 9:56am CST
Hi i'm very new with doing food selling and i have started with making cookies now I am planning to do consignment in one of the convenience store here in my place in the Philippines. The thing is when I inquired about it and asked for requirements they were asking me of a proposal letter for consignment and my terms in consigning with them? they were also asking me about the discount or the percentage that they will earn if i consigned with them. since I am very new with this i don't have any idea on how to do it or what are the things that should be included in my terms. Another thing I don't know what is the usual discount or percentage to give out if I consign. please help me with this I am at lost and I needed every help that i can have. Thanks.