And about Google Play Store:
You cannot just sideload this, AFAIK. You need to have the "package" gApps installed. That should be done when setting up the new operating system, wether internally or on sd-card. If installed correctly you get to a welcome screen where you're asked to set up or sign in to your Google account. If you don't get that you need to looks through the instructions and see if there is a step with gApps that you may have missed.
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