Welcome to the community! Iād say the best place to get inspiration from other projects is the Demos and projects section on the forum. You can find a lot of amazing games there! 
Searching specifically for RTS on the forum also yields some nice results, such as RTS-Camera (WASD move, EQ rotate, mousewheel zoom, edge scroll) - Tutorials and tips - Babylon.js (babylonjs.com) and RTS: Fog of War - Questions - Babylon.js (babylonjs.com)
I hope these resources help you get started and wish you luck in your development journey!