Need help with flashing a ROM/Recovery to my Android Tablet.

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http://forum.xda-developers.com – My friend bought a Tablet for me in Taiwan and I want to flash a custom ROM to it. Because it was purchased in Taiwan, I wasn't able to find it online by Google... Here are the specs for the Tablet: Android Version: 4.0.3 Baseband Version: 1.2rc2 Kernel Version: 3.0.8+ Build Number: mid-eng 4.0.3 CPU: ARM Cortex A8 1GHz GPU: ARM Mali 400 MP GPU RAM: 512MB -How do I tell if a recovery is installed? -How do I flash a recovery? -How do I flash a custom ROM, and what is the highest Android version my Tablet can support? I think my Tablet is rooted, because when I typed "su&quot (HowTos)