APKMirror is owned by Illogical Robot LLC, which also owns the Android-focused news site Android Police.
You will be downloading all of these files from. You can find out which tablet you have at: Settings > Device Options > About Fire Tablet. Different Fire tablets run different versions of Android, so the files you need to install vary according to which Fire tablet you have. Here's where it gets a little complicated. The first three are frameworks that the last one-the Play Store app-needs to function, so they need to be installed first. We need to download four applications to get the Google Play Store working: Google Account Manager, Google Services Framework, Google Play Service, and Google Play Store.