It depends on whether or not you're lazy...
It works like this, you want to ride, ok, go take the course, see if you enjoy it, lets say you do, and you'r bitten by the bug, that's cool, so you go buy a bike, do not go and buy an expensive bike like a Scrambler (they're not expensive in the grand scheme of things to buy, but to crash? yep, expensive to fix! So you have a good reliable 2nd hand bike to ride and learn on, just because you've done your test doesn't mean you know how to ride you know, you will gain experience everytime you ride. Got good gear? this is where it can get expensive, buy quality gear that fits, if it's not comfortable you will be distracted and less likely to put it on, so make sure you're comfortable, a good fitting helmet is more important than the fancy paint job, and a comfortable jacket and gloves are worth more than any fancy bling you want for the bike.
Now, are you lazy? If you think you want to ride but can't be bothered putting the right gear on before you go cause you're just going to the shops then stop your plans to ride a bike, it's not for you. Falling off sucks, i've done it plenty, it's embarrassing and it can get expensive, but falling off in jeans and a t-shirt? that can end with money woes and a hit to the ego being the least of your problems. Don't want to wear the gear? don't ride, unless you think skin grafts and external fixators are cool that is.
It's worth remembering that at 50 mph you travel 20 metres per second, and physics doesn't care whether it's your bare skin on the pavement or your rolling tyre, you're not going to stop in one second either so imagine your soft skin being dragged 20metres per second until you scrub off speed or hit something, gonna wear gear?
My Dad told me that life too short to learn enough from our own experience, we need to learn from others, when it comes to riding bikes there has never been a truer word spoken, sure it's romantic to think you're the Fonz but it wears off pretty quickly when you're an hour from home in a rain storm, i really enjoy riding, been doing it a long time, and i've spent my time in hospital from some pretty serious injuries, i'm lucky to be here frankly, and that's no exaggeration, and i wouldn't talk anyone out of experiencing it, but know what you're getting into and what's required to at least lessen the odds of being hurt, treat everyone on the road with suspicion, don't commit to anything at an intersection until you're sure of what everyone else is doing first, and at the end of the day being in the right legally is cold comfort when you're in a cast or worse, so stay calm and watch everyone and wait for them to do what you see they want to do. Oh, and stay out of drivers blindspots.
This is my bike, for inspiration....
Good luck!