What should be a non-technical founders first steps be?

I have a start up idea, but not very much technical experience. I have a little, but not enough to create what's in my head. What would be the best way to get started. This would be my very first start up and would like to try and do things as correctly as possible with very little costs because I am a college student. Would creating a business plan and a landing page be the ideal way to go? I know in order to gain some traction, investors, or a technical cofounder I would need to show that there's a need, want or desire for my service. I do know a few sport celebrities that can possibly help me get this out. How should I go about this?