(Blynk controlled RV) Need help figuring out what I need to make this work

Here is an update on the project thus far

I got a raspberry pi zero w and on the pi, I installed the script


I also have the local blynk server running on this and static IP address etc…

I also got a bunch of these to use as my switches
https://www.itead.cc/smart-home/sonoff-sv.html

I also have a nextion display (I figure I could add this last after everything is working)

Then I flashed all of those with tasmota

But now I’m not sure where to start. What are my next steps? Thanks