[RMXP] IDEAS FOR CUSTOM SHOP SCRIPT

Hi, I'm looking to customize the shops in my game and I haven't been able to find a script that can make the store look how I want, so I am trying to enlist some help to make a cool shop script.
I want to change a few things in the main shop windows that I think will be an improvement. (The main thing that made me want to create a custom shop is a bookstore in my game, so I will use a bookshop as the example for what the changes in the script would facilitate.) I want to have the following changes:

In the opening screen of the shop, when it just says: 'Buy' | 'Sell | 'Exit' | 'x Gold' with a blank heading and a blank window below, I want to have the script be able to call each shop an individual event, so you can make a list of all the shops in your game if you want to use this script to individualize them. Specifically, so you can make the heading have a greeting, like 'Welcome to the World's End Book Store' and then have an option to change the 'buy' 'sell' 'exit' to your own entries like 'explore' 'hawk' 'leave'
and then in the space below that you can have a longer desciption of the shop, 'Then World's End book shop specializes in occult and esoteric books and has books that you won't find anywhere else.'

and THEN, when you click on 'explore' (meaning 'buy') the only thing I want to change on that page is in the window in the lower right where it says 'number in possession' if instead (as I don't think that information is necessarily needed) you could put a picture of a designated size, like the book cover, or whatever the item happens to be in your store, and then short text entry below that that describes the item, additional to the item title and description at the top, because it seems like that room runs out too fast.

Anyway, this is the script I am really hoping someone can help me to make.