My First Build: Victorian Room Box

I thought I'd get my feet wet by starting with a room box. I purchased an interesting one from Earth and Tree that has a door and a window in the back wall, and behind that is a second back wall, allowing for decorating outside the window. My vision is a Victorian drawing room with a tree and a garden visible through the window. It's coming along quite slowly (which is fine), but at present it's at a standstill while I study how to do the wiring. I choose to use round wire, and, while I know that I'm capable and it's just one room and I have a supportive boyfriend who has lots of tools, I'm intimidated and stalled at this point because I have no experience yet with wiring.