NewbieSue wrote:
I don't think I can even do what I want to do on a mini iPad. Basically, all I want to know is how to be able to fill out forms online.
That depends on what exactly these forms are. Forms can take many "forms" no pun intended.
You can use your iPad to fill out forms that are presented on a website. For instance if you open this link: There's a form here. you'll find a form to contact Apple Support. You don't need to fill it in, its just an example, but you could fill it directly on your iPad through Safari. This is what's known as a Webform.
If the form you wish to fill out comes in the form of a PDF you must download, then you need some App that can actually help you fill it once its downloaded.
Adobe Reader is able to do it. You would need to download the Adobe Reader App from the App Store on your iPad. Its compatible with all iPads that can at least run iOS 9. Which all iPad Mini's can.
https://itunes.apple.com/us/app/adobe-acrobat-reader-annotate/id469337564?mt=8
To download a PDF form in safari can be as simple as clicking on a link. Safari should open the PDF directly in itself, but you can use the "Open in..." option once its downloaded to move it into Adobe Reader or some other App to you want to use to complete it.

Once you tap on "Open in...", you will get a selection of options and a list of Apps you can open the downloaded PDF in. After you install Adobe Reader it should appear there as an option to open the PDF in.