Drop down to populate text field and image

I'm new to doing anything in Adobe other than just reading a pdf.. so I apologize. I've searched this forum and I've been able to get close to what I want but something just isn't working and I think it's my dumbness... haha

Ok here's what I'm trying to do. I'm making a form and I want to pick a town from the drop down and it populate a street address in a text field and populate an image of that address's signature at the bottom. Example: Selecting New York, NY in my drop down would auto fill 123 example st in the text field and my signature image will pop up... buthten if I select Los Angeles, Ca in the drop down the text box would change to 456 Hollywood Dr and my signature would hide and my friend's would become visible.  I've got it  up until I make a different selection and the now non selected signature doesn't return to hiding... so then I end up with both images visible... Help? please?