If you plan on getting a bike, it is a MUST to do a proper motorcycle training course. It doesn't matter how long you've driven for, or even ridden dirt bikes. DO THE TRAINING. Don't fuck around on the course, take everything they say seriously and it'll save your life more than once. If you're expected to follow certain licensing restrictions while you learn, or get your provisional licence, obey the rules, and go at it slowly.
When I got my licence to ride, it was a 3 day safety course, a further 3 days for advanced training, and then a year before you could ride anything over a 600cc cycle (without special recommendation). I ended up never wanting anything over 600cc (even though I got cleared for 600+ during my advanced course).
There's no real difference in driving a car and riding a bike as far as safety goes, all the same rules apply. Expect people to do dumb shit, give them room to do dumb shit, and give yourself time to avoid the dumb shit when it happens. The only difference between the two is that if you slip up and don't allow/expect/cover for other peoples mistakes, you'll end up dead, or missing limbs.