No problem. Sounds like we are in a similar boat. :-)
About visual scripting, I'm just not a coder, I don't know the expressions and how to type it, but I believe I understand the logic of code. And as such, visual scripting is a way to create code without writing it. It's much easier to explain and understand visually, so look up visual scripting tools on Google to get a quick and better picture. As I work with Unity, I tried a few options such as PlayMaker, Bolt and GameFlow before settling on GameFlow (which is very similar to RPG Maker, as it's just a series of commands read from top to bottom). Bolt is more like actually coding without having to type (I found it very intimidating for a beginner) and PlayMaker is forcing everything to be a state-machine (you tell every object in the game what to do at all times, and what they do changes depending on the situation, making the object change from state to state... hope that makes sense). PlayMaker is the most popular option, and has extensive documentation online, if you want to get into it.
As for the 'retro' shaders, you have a few options. I personally use Flashback94 (found on the Unity Asset Store), but most devs I know started out using DSoft20's PSX RetroShader, which is free : https://github.com/dsoft20/psx_retroshader
There is also Keijiro's shaders who are pretty popular, make sure to check out their other stuff : https://github.com/keijiro/Retro3D
Recently, fellow low-poly dev LeakyFingers made a similar shader for Unity as well : https://leakyfingers.itch.io/retro-3d-shader-pack-for-unity
So your options are pretty wide opened. Test a few of them and settle for the one with a UI that clicks best with your brain. Happy game making!