looking for info on how to create inventory list, product info, and packing slip/invoice

First off, thankyou for taking the time to read my post. I haven't used excel in YEARS so im lost at the moment.
I need to be able to keep track of inventory, make packing slips, and invoices. I would like to be able to have packing slips and invoices auto populate product info so i don't have to type everything over and over. I am looking at setting up a shopify store so i would like to be able to import my inventory stock to my shopify account (from what i have read, certain apps can import excel files).
Im sorry, its late and i hope i haven't messed this up again. I would love some advice on how to best accomplish this, maybe point me in the right direction to articles that will help me learn what i need to know, and any thoughts of a better solution?
thanks for your time!

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Thank You for changing the title.
You might look through the Excel templates for inventories found at the link below. Also notice that from that page there is a link to invoice templates.
https://templates.office.com/en-us/Inventories?page=1
Perhaps that will get you started.