Hi mattress140,
The mattress shopping tutorial here has all the basic information, steps, and guidelines that can help you make the best possible choices … and perhaps more importantly, help you know how and why to avoid the worst ones.
If you have already purchased a mattress then post #13 here includes more information about the most important parts of the “value” of a mattress purchase that can help you make more meaningful comparisons between mattresses.
If you can provide a link to the mattress you purchased I’d be happy to make some comments about it as well.
Phoenix