From a newbie..... what about standard lead bullets. Is it OK to use them?
I would stay away from them. I have shot lead thru one of my Glocks, but never more than 50 or so in one range session and even then I had a hell of a time cleaning the lead out of the barrel. If you put enough lead down the pipe you will eventually have a problem, possibly a dangerous one.
I'm sure someone, somewhere posted that they put thousands of rounds of lead through their factory Glock barrel without a problem. I'm not saying it can't be done, but I'd recommend against it. IANAL, YMMV, proceed at your own risk.
The plated bullets work just fine. Although they're not as cheap as lead, they're considerably less expensive than fully jacketed bullets.
If you really want to shoot lead bullets in your Glock, save for an aftermarket barrel with traditional rifling. You can put all the lead you want down those. I know several guys that are very pleased with KKM barrels.