I have 4 CBX's '79-2, '81 Turbo, & '82.
If you are using stock forks and not a real agressive rider, the ATF fluid works just fine. If you are using performance forks, have other internal modifications, or prefer the twisties, you can experiment with different weight oils. I believe that ATF is about 10W ...
I'm thinking that has front brakes. If there is a cable running to hub from handle bars, then yes. Also, look for an arm sticking out from side of center hub that may have had a brake hooked up if no cable from handle bars. Rotating that slightly one way or the other should release brakes, and apply them the other way. If that doesn't work and the linkage (arm) is there for brakes, you may have to pull front wheel and pull it apart to fix.
loosen the band clamp on both ends of the carb, remove the throttle cables and the fuel lines, if its a cv carb, remove the vacuum lines, then wiggle the carbs out of the rubber boots they are in(airbox and intake boots) . if they are mounted to eachother do not disconnect them. thats all i can give you without knowing which bike you have.