Hi leezacooper,
I’m not clear if you’re looking for a mattress or bedding but if it’s a mattress … then post #1 here has the basic information, steps, and guidelines that can help you make the best possible choice.
If you’re looking for bedding … then post #28 here and the posts and information it links to has more information about the different types of fabrics and sheets and the pros and cons of each and some sources for bedding.
Phoenix