“google play ” not working

guys please help i flashed my mobile Xiaomi redmi note 2 with external Rom and now it erased my google play store and i cannot install it externally..
any suggestions ?
Answer #1
go back to the thread you downloaded the rom from and check for something called “GApps”, that’s your google apps (incl play store). Almost no developper adds the GApps to their rom to keep the download size down as much as possible and because the gapps get updated so frequently
Answer #2
Or try an alternative store like aptoide or 1mobilemarket.