ESP8266 code loading?

[Nandis]

I have a couple of ESP8266 and RS485 boards to replicate Daniels setup reading SDM630 meters.

I have been looking about on the various Arduino pages but cant find something with explains how to load the ESP8266 so that it can poll the meters and send the data via wifi? I can connect to the ESP8266 fine but how much code has to be loaded on it and how much is running on a RPi?

Hoping someone can explain which or how many of the INO files etc need to be flashed (if any?) Thanks.

Off topic. Does anyone know If you can retrieve data from web pages streight into access table, such as a web scraping software https://mydataprovider.com/tools/ does it ?

I have no idea how to do that yet. Any ideas Guys ?