Many repacks are "de-googled." If you want the Play Store, you must download and flash a "Micro" or "Pico" 4.4.4 GApps ZIP immediately after the ROM.
Stripping out heavy carrier apps to improve speed. download android 444 kitkat zip file repack repack
Flashing a new OS will wipe your internal data. Back up your photos and contacts. Many repacks are "de-googled
You will need TWRP (Team Win Recovery Project) or ClockworkMod (CWM) installed. download android 444 kitkat zip file repack repack
Power off your device, then hold the Volume Down + Power buttons (this varies by manufacturer).
Use the search bar for your device codename + "4.4.4 repack."