do you mean set the cam timing? You can't adjust the ignition timing on a CBR, it's not a pre-unit triumph
Get a haynes book, if you have a non-runner you'll need one.
I say check some easier stuff first - blocked pilot jets, fuel filter, crossed HT leads, duff spark plugs. Spray ether into the carbs, if it starts you have spark but no fuel. You may have spark, but it could be too weak or at the wrong point in the cycle.
If your battery isn't strong (12.8v is ideal at rest 24hr after charging, 12.4v is too low for anything) then it won't start even if everything else is good. Ideally get a car battery and try to start off that, it'll take forever to kill off a bike starter.