I'm looking to get my first HO train. I am looking at HO train sets.  I want to use DCC .What do I need to know about couplers and non-magnetic axles? I've looked at Bachmann 4-4-0 with wood tender Sante FE 91 Model 52704. I want to buy cars and a caboose to go with it. I don't know anything about the axles or couplers?

I have looked at a train set Bachmann Durango Silverton set. Will the Model 52704 work with the cars from the Durango Silverton?

is the Durango Silverton DCC ready or do I need to add it>

When buying cars, I prefer aquality car not just a cheap plastic one. What can you recommend?