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Hints

General

Read about IO in the Getting Started guide.
Read about debugging with IO.inspect/2 in the Getting Started guide.
Read about the IO module in the documentation.

1. Welcome the new player

There is a built-in function that writes a string to the standard output.

2. Ask for the character's name

There is a built-in function that reads a string from the standard output. It can also write a prompt, so there is no need to use a separate function to write the question.
There is a build-in function in the String module that can remove trailing and leading whitespace from the input.

3. Ask for the character's class

There is a built-in function that reads a string from the standard output. It can also write a prompt, so there is no need to use a separate function to write the question.
There is a build-in function in the String module that can remove trailing and leading whitespace from the input.

4. Ask for the character's level

There is a built-in function that reads a string from the standard output. It can also write a prompt, so there is no need to use a separate function to write the question.
There is a build-in function in the String module that can remove trailing and leading whitespace from the input.
There is a build-in function in the String module that can convert a string to an integer.

5. Combine previous steps into one

Reuse functions implemented in previous steps.
There is a built-in function, useful for debugging, that can write to the standard output more than just strings. That functions accepts options, for example a string that will be written before the passed value.
The function and its option mentioned above will append a colon and a space to that string for you.