How to fill fields in Word file

I have a word file with text fields, check boxes and Drop downs. How to do automation of this ?
1.when I use replace text Text fields are remains blank and text is getting replaced. But how to remove those empty text fields after replacing text? If not possible how to enter text in the text fields then?
2. How to select drop downs without using hot keys and type into since they are not reliable.
3. How to do check boxes

Thanks in advance,