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I learned Modding and Java almost entirely through trial & error and watching bad YouTube tutorials, so it is possible to just jump right in the deep end and start making mods. I did have prior programming experience (JavaScript, PHP, HTML, etc.) though, and learning Java was still an extremely big learning curve. You should definitely familiarise yourself with the language and read LOTS of Java tutorials. Once you’ve done this I reccomend creating a GitHub account, downloading GitHub Desktop or another git client, going to https://github.com/Cadiboo/Example-Mod and and cloning/forking/downloading the repository. Once you have done this, follow the setup instructions and start Modding! There are lots of good resources in the README of that repository that you should read. Disclaimer: this is a repo that I set up for this situation, if you have problems feel free to contact me. I check these forums semi-regularly, but if you want to talk to me fast you can add me as Cadiboo#8887 on Discord.

I will once I could try it with a fresh directory, in case it was due to something I've done previously.

I already told you: This is a bug in the mod. You cannot do anything, unless you want to grab their code and fix it.

OTG shouldn't have to, its called by world.setBlockState() automatically. Ooh, never mind, Forge did things that make it not called. You could make your block declare that it has a tile entity (hasTileEntity returns true) but never actually supply one (returns from getTileEntity are null checked). That'd make onBlockAdded get called for your blocks.