Uploading apps to playstore is by far the simplest/easiest
Do you have a playstore account already?
if Yes, just goto
https://play.google.com/apps/publish
Click
Create Application
Upload your icon, screenshots, etc - The dimensions are specified on the dashboard
Fill in the necessary details where there are gray checkmarks for the following to make sure they turn green (ok)
-App releases
-Store listing
-content rating
-app content
-pricing and distribution
App Releases is where you will upload your APK. Click manage at Production, and follow the necessary steps to upload the apk.
Save
click on Review
Click on Rollout
Done