I just started riding at the beginning of 2011.
My first piece of advice is to not buy a street bike, but start off with a dirt bike, and do all your learning and crashing with that.
My next piece of advice is not to ride with anybody when you first buy your bike, I'm friends with a lot of stupid people on 2 wheels, and most people cannot control themselves enough to not keep up if their riding skills aren't developed enough to do so safely.
Next, One of the arguments people will have against you getting a liter bike will be: You will never get good at riding bikes if you do not start off with 600cc bike, as you will not need to corner fast to keep up with people. My argument against this would be you shouldn't be keeping up with anybody. The bike will only go as fast as you make it go.
Some valid arguments for not getting a fast bike would be the ease of going 12 o clock with a clutch dump, or throttle twist when you're in powerband. You must remember that when you are scared your first reaction is to jump back which tends to make you twist your wrists, on a 250cc, not a big deal... on a 1000+cc you're probably dead.
The few times I've seen people go down were in corners... start slow and accelerate. Some people get scared mid turn because they took it too fast and use the brake, leading to a bad crash. If you took a corner too fast you must think:
1) can I brake
2) probabbly not, so keep leaning as far as you safely can, while controlling throttle (more or less depending on what is safe)
3) Where will I end up as I take the corner at a different line that I was expecting (the other lane? the dirt?)
4) do not take corners too fast, lol... if you want to "enjoy" a road, ride it a few times so you are aware of every spec of sand on it.
My first bike was a 2002 Honda Super Blackbird (cbr1100xx)
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Not a good first bike in most people's opinion, because it is fast (Honda's hayabusa equivalent), and relatively heavy. But I started slow, rode for about 2000 miles completely alone (because I know myself, and I'm an idiot when I can show off). It was all about not putting myself into the wrong position when I was new to the bike.
I've only ever had one close call. I was taking a corner too sharply and too slow a speed and I felt the bike start falling too far into a lean. I opened the throttle enough to catch this and went wide into the other lane. I learned from this and have had no other close calls (only 6000 miles on the bike by me though).
I never ride if I'm not in the mood to be paying attention either... I'm aware of every car around me at all times, and little things like noticing a car that might want to change lanes, even before the driver has signaled or hinted can save your life, maybe when passing a car on the highway just do so quickly and keep a finger on the horn... always do the other drivers paying attention for them.
One thing I have never done is have even a sip of alcohol and get on the bike. I will have a few beers and drive a car, but would never do the same for a bike, I do not know why, but I just won't.
Just some advice / thoughts / experiences I figured I'd share. I should not I'm only 20 so you know where the advice is coming from.