Porgramming on a TI-84 Calculator. Help?

I'm learning how to code on my TI-84. My goal is to make a program for each chapter in my AP Physics class, with a list of equations relating to the chapter's topic. Once an equation is chosen from the list, it asks you which variable in the equation is the unknown, then prompts you for the other... show more I'm learning how to code on my TI-84. My goal is to make a program for each chapter in my AP Physics class, with a list of equations relating to the chapter's topic. Once an equation is chosen from the list, it asks you which variable in the equation is the unknown, then prompts you for the other variables and ultimately gives you the unknown. It's helpful for 2 things: 1) giving the base equation, and 2) quickly getting an answer

However, I'm running into a few issues since this is my first time coding on my calculator. So if you know how to do any of these, I'd appreciate some help!

1) Is there any way to write the code on my laptop, or does it HAVE to be done on the calculator?
2) Somewhat unrelated, I have one program ("ACCELERA" -- freefall equations) that functions as described above, but does not appear on the list when I move over to the Edit column. Any idea why this is and how I could observe the coding?
3) Is there any way to put subscripts? Specifically a sub-0 and sub-f
4) Can you "Prompt" a variable with more than one char? For example, to prompt "V naut", I'd love to prompt "V.", "VNAUT", or "V(sub-0)". For Delta-X, it'd be useful to prompt for <>x instead of just x.
5) Can you use multi-char labels? If not, how do you have more than 26?
6) How do you return to the original menu (not a label?) For example, if I enter the program and go to the menu "EQUATIONS", then go to Label A (the first equation), then select option 5 ("BACK"), how can I make it return to the menu "EQUATIONS"?

Thanks for any and all help! I apprecaite it :)
Update: Forgot one thing!
7) Most of the equations on the list go off-screen. How can I make the menu items wrap around to a second line instead of getting chopped off?
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