What VCDS variant to get? I'm literally confused

I have a passat b6 2007 year BMP engine code 2.0 TDI 140 HP, manual gearbox. I don't know what VCDS version to get I want to fully unlock/code/do anything on that car by myself. There are multiple VCDS connector and I am confused for this volkswagen passat I am interested... and if someone explain to me what's difference between versions... it will be amazing... I need for coding regeneration , features, cornering lights i kinda want to duplicate my car key cause it cost me 150 euro to do it and if I could do it for cheaper it will be amazing... I think I can do that with VCDS to duplicate my key also I have keyless which isn't working and I want to reset and verify what's wrong with my car.