OpenRA

Hey so I've been playing OpenRA for a little while now, and I had an idea to basically recreate a old browser based C&C clone in OpenRA, I have had experience with modding before with some other games so I'm not entirely clueless, but I'm not sure where to start with OpenRA or if its even feasible for someone of my skill level to take on, so I'm looking for some advice on where to start and what tools I'll need for maps, converting graphics, cutscenes and all that stuff, also is there any sort of scripting I can utilize or will I have to dive into the source code to create new units, buildings, and such?
so if anyone is willing to give me somewhere to start that would be great

Thank you for your guidance!