There is an excellent free factsheet on materials to use in storage and display cases at
Hope this helps as a start.
The basic principles are
1) use chemically inert, stable materials as much as possible – stainless steel, glass, Perspex (Plexiglass), acid-free card, scoured unbleached cotton or well-washed polyester cloth, polyester felt (not wool) and acid-free adhesives.
2) avoid materials which give off acidic, alkaline or otherwise harmful volatile components such as unsealed wood, medium density fiberboard and other wood products, cloth with unknown dyes and treatments which can cause adverse reactions with objects.
3) whenever possible try out samples of the materials using the Oddy test http://en.wikipedia.org/wiki/Oddy_test
Hope this helps you to get started. Even very small museums, with tiny budgets, have been able to find low-cost solutions that meet these principles.