IRAnewbie,
Like John said, it's great that you have so much money to invest for a teenager. And the sooner the better. Time lost is irrecoverable.
You do need some kind of emergency funds on hand, in case of a disaster. However, I'd recommend that you first try to max out your Roth IRA contributions. You can add money to your emergency fund any time you want, but for the Roth IRA, you are limited to 3k a year; so if you miss contributing the max one year, that's it -- you're done, and there's no opportunity to make it up.
So, max out your RothIRA contribution and then start scrapping together as much money as you can for an emergency fund. You should note that you can always withdraw the total dollar amount of your contributions to a Roth IRA. However, you should not think of Roth IRA funds as emergency funds that can be tapped. You should think of it as retirement funds. For the most part, if you can live without tapping into your Roth, then you shouldn't tap into it. If you get in a situation where you literally don't have enough money to survive, and where you would otherwise have to borrow money at very high interest rates, then it might be worth considering (consult a financial planner if you ever have to cross that bridge).
Another thing to consider is that you never know *if* you're going to have enough money from your job to contribute to a RothIRA next year, or the year after, or after. So, I suggest that, in as far as possible, you put aside as much money <I>right now</I> in a money-market fund as you can for future contributions to a Roth. Right now, the US government is in an enormous amount of debt, and it's very unlikely that taxes are going to stay as low as they are now; when taxes are raised, that will cut into your ability to fund your retirement. Thus, you should plan for that now (money you put aside now in a "taxable" money-market is only taxed on gains).
In any respect, maxing out your RothIRA contributions is a good idea. Because I'm not too optimistic about the market right now (inflation, an increase in the monetary supply, is rampant), I would suggest using caution when investing.
Some good website to look at:
FinancialSense.comRothIRA.comFidelity Investors WeeklyKiplenger's magazine is pretty good, although it includes lots of fluff (ads and irrelevant articles), but most websites include fluff too.