Need help planning out thought process for ideas

Hi everyone,

I’m a first year compsci student and I have one particular idea that I want to turn into a software/web…

I really need help solidifying this, as I have never actually developed any sort of program.

What should I work on first, how should I plan out datelines? Picking native bases…

I know some languages and algrorithms, per say python, c and javascript.

Thanks for your kind contribution !