New Project: Upload/Handling/Download

Hi everybody,

I'm very new in this topic and so I have a question to what I am planning.

I want to have an upload area to upload files.
These files always are .txt files. Now I want to count all words for example in such a file and print it in a panel or create a new txt-file, which I can download.

This model can be upgraded with other functions.

How can I realize this project ?

I've read many tutorials and other stuff but they don't give me the right answer to my problem.

Thanks for help