My phone (Nokia XL) did not come with Google Play application. How do i install it (i've already tried with some weird .apk files)? If my phone cant use Google Play can you at least tell me if there is some way i can download the apps on my computer and then send them to my phone through USB. Thanks
You can't use Google Play unless your phone has installed the Google Play Services to the /system partition, which is only possible through flashing it. (If you don't have root access).
The .apk of Google Play is only for use with phones installed Google Play Services.
The Play Store is the frontend of the Store, which only shows you information and let you interact with the services. The Play Services are installed at the /system partition (because they need higher privileges to install and uninstall applications). This is the backend of the Play Store (and other Google apps).
Means: If you don't have the Play Services installed, the Play Store can't do anything.
Although Nokia XL is based on the Android Open Source Project with Nokia's interface layered on top, it does not come with Google services due to Nokia's contract with Microsoft. However, there is a solution though it involves rooting your phone. You will void your warranty or even ruin your phone;try at your own risk. If you want to want to risk it, Google is your friend. Here is one example http://androidrootcentral.com/root-and-install-playstore-nokia-xseries/