Start reading this:
https://discuss.eroscripts.com/t/how-to-get-started-with-scripting/2234
It might seem like a lot to read, but sift through the guide and you will find that it is quite easy to get started with either OpenFunScripter or JoyFunScripter. The software are very similar in their core functionality, but there are also differences. Try them out and use the one that suits your needs. Both software can be found in the software section in this forum. Be sure to read any installations instructions. Not installing pre-requisites is the most common reason if they are not working properly.