The Lionel stuff is covered in:
https://www.tmbv.com/Modern-O-...roductinfo/LEGACYBK/
The MTH stuff is covered in:
https://www.amazon.com/DCS-Com...Caps%2C76&sr=8-1
I'm not aware of any recent DCC books but there are some from 8-10 years ago. DCC, in my opinion, is not really all that relevant to three rail O gauge unless you are interested in doing a fair amount of hands on technical modifications and buying used locomotives since the only producer of DCC locomotives for O gauge, three rail, MTH is no longer producing a full line of products. And DCC cannot be operated at the same time as PS2 and Legacy/TMCC/LionChief equipped locos. As for instructions on combining DCC equipped locos and those from Lionel, you're pretty much on your own.