We are in the process of designing wax paper drink cups and paper
popcorn bags.  We are printing custom containers in an effort to meet
the following objectives:
1. Sell more product by creating attractive containers
2. Sell more product by enticing people to choose larger containers
3. Market our website and business
I am looking for marketing tips that will help us meet these
objectives.  For instance, what primary color should we use on the
largest size so that the majority of people favor it and perceive
value when choosing it?   Are there any do's and don't to consider
when creating artwork to market food products?

Hello n2film-ga,

Here is some information and a number of books that might be of your interest.

How color influences the consumer decision making process
http://www.colormatters.com/bubdarc14-consumer.html

50 Trade Secrets of Great Design: Packaging
by Stafford Cliff 
http://www.amazon.com/exec/obidos/tg/detail/-/1564968723/ref=pd_sim_books_1/103-4687575-5498207?v=glance&s=books

The Perfect Package: How to Add Value Through Graphic Design
by Catherine M. Fishel 
http://www.amazon.com/exec/obidos/tg/detail/-/1592530125/ref=pd_sim_books_4/103-4687575-5498207?v=glance&s=books


The Total Package: The Secret History and Hidden Meanings of Boxes,
Bottles, Cans, and Other Persuasive Containers
by Thomas Hine http://www.amazon.com/exec/obidos/ASIN/0316365467/qid=1093020315/sr=ka-1/ref=pd_ka_1/103-4687575-5498207

The Total Package: The Evolution and Secret Meanings of Boxes,
Bottles, Cans, and Tubes
http://www.amazon.com/exec/obidos/ASIN/0316364800/qid=1093020315/sr=ka-2/ref=pd_ka_2/103-4687575-5498207
by Thomas Hine 

Best regards,
Bobbie7
Google Answers Researcher