1) yep, wifi card default not working(version not support for mac), I have replace with new BCM4322 for works. When you replace with new card, a bit your hardware not working, such as you can't turn on/off wifi via hotkey Fn + F2 and and Wifi lights always turn off (both mac and windows). With me, it no problems, I can control wifi via icon in the menubar and taskbar.
2) You can try with driver AppleIntelSNBGraphicsFB.kext, I'm working on 10.10, 10.10.1 and 10.10.2. Install with Kext Wizard(remember backup current kext for safe), and Repair Permissions & Rebuild Cache before reboot
3) From 10.10, the system could not load kext from 3th party, example: VoodooHDA, Network driver,... which driver you fix on the use of the term 'Hackintosh'. So, you need boot with flag kext-dev-mode=1 as developer, the system will load all the kext.