Patch salopette over a overall

So, I have this overall I have from a work I did in the past. I know I'm not using it again because I hated those tipe of jobs, so I wanted to transform it into something like patch pants/salopette.

It's blue and made of cotton and polyester. I'm planning to sew on it patches, pins, chains and stuff like that; and I think I'll paint on it.

Now, my question is: it would be the first time ever I do something like that, and I don't want to mess up everything. What do you recommend to me? For example, if I want to paint, what should I use? I saw on internet some colors, but if I want to paint a whole pant what I use?

Thank you guys (⁠✿⁠^{⁠‿⁠⁠)}