Where To Begin? (With Experience)

Hello,

This is my first post in this group. I hope this is allowed!

I have quite a few years experience in C# & Java game development; 5 years recreationally and 2 years professionally. I’m looking to learn software development, after a lengthy hiatus, because there’s currently a high demand for it in my region, but I have no idea where to begin…

Without going into great detail, the first software I’d like to develop is a simple automated emailing system. It would send an email to customers on the day of their scheduled appointment with an appraised value of their asset (from my clients database) + another value, to compare, scraped from a competitor’s appraisal website.

Could someone point me in the right direction to get started, or maybe share some pointers here?

Thank you in advance.