Show new fields after previous field is filled

How do I make it that the form only brings up one question as a time, as and the person fills in the form, the next question appears and then the next question appears?

You can use the SHOW/HIDE FIELD condition to show fields after the previous field is filled. I have created a demo form for you, please see below:

Here's how the conditions look like:

You can review/clone the form via the URL below:

https://form.jotformpro.com/71726571177967

Here's how to clone a form into your account:

How-to-Clone-an-Existing-Form-from-a-URL

For more information on conditional logic, please see:

Smart-Forms-Using-Conditional-Logic

thank you!

 the only thing that is not nice is that the second you type in the first letter in field A then field B appears. Please fix that to only show up when the person has finished typing the question? Or is there a way I can fix this? 

the only thing that is not nice is that the second you type in the first letter in field A then field B appears. Please fix that to only show up when the person has finished typing the question? It looks cheap!

That is not a bug. If you are using State "Is Filled" as soon as you type any character in field A field B will be shown, because fields A is filled (it dose contain data). Form can not know when your user has finished typing. Only workaround that I can provide you if you want to use State "Is Filled" is to add page breaks to your form after each of your fields, so that your users have to click on Next button to see the next question. 

Here is a demo form: https://form.jotformpro.com/71775398485980 

How to Show or Hide Fields Base on User's Answer

Let us know if you need further assistance.