Hi spartan914,
Welcome … and I’m glad you found your way here 
There is a lot of information here but just in case you haven’t read it yet … the first place to start is the mattress shopping tutorial here which has all the basic information, steps, and guidelines that can help you make the best possible choice … and perhaps most importantly help with how and why to avoid the worst ones.
I’m looking forward to finding out what you end up deciding and of course any comments or questions you may have along the way.
Phoenix