Howdy Max!
Congrats on getting started on building a layout! Once you see those RailPro engines kicking cars around you won't be sorry you put the effort in!
W/regard to your Atlas turnouts, there isn't anything unique to RailPro that would be an issue with using them.
The issue you may have is if the frogs in those turnouts is powered or unpowered. I am not familiar with Atlas turnouts and don't know if they are "DCC friendly". Even though RailPro isn't a DCC system, the frogs can still be an issue. Depending on your locos and and how many wheels pick up power, they could stall out as they cross over the frog. It is best if you have powered frogs, or, "DCC friendly" turnouts.
From pictures of those turnouts on the web, the frogs appear to be plastic/unpowered.
This forum isn't the best place for a question about Atlas turnouts. You would probably be better off asking about them over in the Model Railroad Hobbyist (MRH) Forum, or some other general model railroading forum.
To your other question, sure, you can use a straight DC power pack to run the switches using the included toggle switch.