Back to the original question, to set up your track, all you need to do is connect 2 wires. If you have reversing loops you spend $45 and isolate that section of track.
Wiring is dead simple.
For your locos, you have lots of options, you might indicate if you want sound. If you do, then I suggest you buy an “integrated” DCC decoder that has motor, light, and sound all in one.
The control over sound in DCC is way beyond any other system, other than the MTH DCS system, which has approximately the same capability. (Battery guys, don’t go here, I can control 30 individual sounds, fine tune the volumes and more)
Some locos come with a socket that makes it really easy, just 5 minute install. Others will take some hardwiring. It’s really not that tough.
On control systems, you can go from mild to wild on them. You might want an entry level system, but be aware there may be some limitations, that’s why they are cheaper.
Depending on how large your layout will be, you may only need about 5 amps capacity, that will save some $$.
Regards, Greg