Going on a training course would help. As for knowing which gear you're in, you'll eventually get a feel of which gear your in or you could learn a few important points on the rev counter, for particular gears. For example my V-strom does 4000rpm at 40mph in fourth gear, which is really useful. So if the engines revving faster or slower than 1000rpm/10mph, I can pretty much guess which gear I'm in. It's also useful to know when you're in top gear so at 60mph I know the revs will be 4500rpm. There will be similar points to memorise for the CBR - remembering three or four of these points will help you work out which gear you're in.