How to flash/install CWM or TWRP to an unknown device

I live here on Dubai. I bought my Tab named "Q-wave781M"(Which is not known) with 4.2.2 firmware cost 600+ AED. I want to update it atleast 4.3 or 4.4. Checked the About Tablet then update but nothing pop out. I dl'ed an app that check what firmware i can upgrade to and it possible for 4.4. 2 weeks ago i learned about custom roms. But there is a possibility to brick if it's not properly installed. I dl'ed Rom Manager but cwm/twrp doesn't support the device(Can't install/flash). A msg said it's installed but after booting to recovery still the stock recovery. I'm newbie here and modding android. Please help. Ty.