My geiger doesn't seem connected

Once you've got a hold of a ESP8266 (Wemos Mini D1 is what I'd recommend) have a look at https://github.com/steadramon/ESPGeiger/

You can install the firmware to your D1 Mini direct from your browser at https://install.espgeiger.com - you'd want to set the option to Pulse counter, flash it and connect it to the D1 Mini like so -
 

Once installed look for a WiFi hotspot with the name in the format of ESPGeiger-abcdf - connect and configure your WiFi settings. From there you can browse to the D1 mini on your browser: 

And you can configure your Radmon details in the configuration pages

Hi, indeed this is the main goal of the firmware project, to be easy to install and use for new and old users alike The firmware also appeals to the IOT community who like to measure, record and graph everything - for this reason the firmware also allows users to configure measurements to be relayed to Radmon, MQTT and Homeassistant - amongst others!

For the more experienced Arduino coders I welcome feedback and Pull Requests to improve the overall code and help to standardise and make more reliable the devices that post to radmon.org

I have the circuit what is the next step? thanks

From the instructions above -

You can install the firmware to your D1 Mini direct from your browser at https://install.espgeiger.com (use Chrome or Edge).

From the webpage choose Pulse counter, connect your D1 mini to your computer using USB (make sure you have the right drivers installed)

Once flashed connect the Geiger Counter to the D1 Mini like so -

 

Once installed look for a WiFi hotspot with the name in the format of ESPGeiger-abcdf (make a note of this name) - connect and configure your WiFi settings. From there you can browse to the D1 mini on your browser by visiting http://ESPGeiger-abcdf.local