<< from where should I start?

Make very small ones, reload yet made, and training 26 h / 24 h ! :)
And of course https://moiscript.weebly.com/biblio-elephant.html
Bon courage!

PS It's more easy to use a Node(s) than create it!
This one by r2d3 is a true gem: you can animate anything along any path! :)
https://moi3d.com/forum/index.php?webtag=MOI&msg=7777.878