You have a lot of work cut out for you, but if you stick these advice, you may find yourself with a team if they see worth in your project ideas.
- Join the 3ds homebrew discordapp. Make yourself known. Also learn with 3dbrew.org and study other's source code.
- Start a Github page and post source code that is compile-able with Make in devkitpro.
- Establish your reputation a little longer until people can vouch for you.
- Program and produce one piece of noteworthy homebrew before calling on the other devs. Come back when you're ready.
Good luck!
Note: devkitpro is name of the organisation making the tools. the toolchain is called devkitARM