You can redownload everything but dint need to pay again - but anything you have done in those sold will be lost as will you settings
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Does it show up in fastboot and do you have custom recovery?
If no to both then I'm sorry you have a hard brick.
If yes to first flash a system image (google the method for your device)
If yes to second then look for sideload (not available on all recoveries) and flash zips via adb
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Go to gapps early and download/install to a slightly earlier google app version until it works. Then go to the play store find the google app and click it, then go to the overflow menu and deselect auto update
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