Hello everyone!

I am praying that someone can give me a little guidance with this... I know this is a very, very simple task, but I am completely new to all of this and very, very confused.

Okay, so anyway. What I am trying to do is create a very basic html/javascript form that will appear sort of like this:

Enter Integer Number (0-99):
Enter Real Number (0.0-10.0):
Enter String:

Submit Button
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And then if the user inputs everything correctly, the screen will display this:

Integer Number = (whatever number they entered)
Real Number = (whatever number they entered)
String Length = (the number of letters in the word they entered)

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But if the user made an error while filling out the form (i.e. whatever they put in the first box isn't an integer from 0-99, or whatever they put in the "Enter String:" box wasn't letters, etc.), then I need to have an error alert box appear.

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That's all I need to figure out, and I literally am so lost that I don't even know where to start any help would be GREATLY appreciated! Thank you so much!!