No search values are shown on the page

My first guess to you first problem would be, that you have not purchased Card JX.

And guess according to the second problem, is that you might have space character in your database field's names. It is good to avoid space character and all other non ascii character in any of the database field's or table's names.

I am not talking about changing the values, I am talking about changing the field names in the database. If your field name in database is "NAAM DANSSCHOOL" it will not work properly. You can set it to "NAAM_DANSSCHOOL" in database, but you are able to change the labels in your backend afterward. There you can set it back to "NAAM DANSSCHOOL" or anything you want to be displayed to your users. This is just my first guess, and maybe I am wrong.

For short strings of known (or expected) length is varchar the best. Otherwise you use text. If there is a possibility that there is no value in a certain field you set it to nullable, but for strings it does not make a lot of difference. Please use UTF-8 encoding (collation) everywhere.