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You have 2 options
1. sideload the play store
or
2. flash the global generic firmware with flashtool
how come you don't have the playstore? check on settings > apps > all > scroll to the bottom.
You may have Chinese firmware installed so you may need to manually flash another country's firmware or try a system repair
Just get the correct FTF file from the XDA Forum
/t5/Xperia-Z2/How-to-manually-update-downgrade-root-2014-Xperias/td-p/593459
use flashtool (link above) and this ftf file