I want to invest money for long term like S&P 500, where should I go ?

How much the minimum to buy that stock ? I know nothing about stock. please serious answer only !

so, how to know which stock to invest in?
when you should buy them?
and, how you can make money from?

fundamentally, you can use various key financial ratios to start screening which stock worth your hard earned money. from there, you can go to the next level by further study how they perform qualitatively. Look here for more info:

How to Pick A Good Stock
http://www.stock-investment-made-easy.co...
Guide in Analyzing Stock
http://www.stock-investment-made-easy.co...

then, you must study how much the stock worth. to do this stock valuation, you have to calculate intrinsic value. once you got it, buy the stock when it is at its margin of safety, either it was discounted than its intrinsic value, or discounted from the past historical prices. Look here for details:

How to Calculate Intrinsic Value
http://www.stock-investment-made-easy.co...
How to Determine Margin of Safety
http://www.stock-investment-made-easy.co...

now the last question, how you can make money from it? look, good company will grow over time. if you invest for your retirement, you can sell the stock after 20 years with as much as 30% return per year! doesn't it sounds good? and besides, you'll be earning dividends year after year, which will also grow annually!

What is Penny Stocks, and How To Choose One
http://www.stock-investment-made-easy.co...

The S&P 500 is not one stock, it is a collection of 500 stocks. Go to Vanguard.com, and buy their 500 Index fund. You can open a regular account or an IRA. There is a $3,000 minimum investment. You can also buy SPY, which is an ETF. There is next to no minimum for an ETF, but you will have to pay a broker's fee.

Here's another vote for Vanguard. They have an S&P 500 Index fund (a fund that mirrors the S&P 500). Index funds are good because the management fees are low. You need $3,000 to initially invest in the fund.

Actually, for long-term investments you're probably better off opening a Roth IRA account (which allows a maximum deposit of $4K per calendar year, going up to $5K next year) and tailoring your profile to an "aggressive" stance where you would be investing almost entirely in stock, which would include investments to both Dow and S&P stocks. You can deposit any amount you want into it at any time up to the annual maximum allowable contribution, no minimum at all, it's tax-free, and you get expert diversification investments to boot so that not all your money is in just a few stocks and the chances of you losing it is much slimmer than if you handled your own investments, especially since by your own admission you know nothing about stock.

The catch, of course, is that you can't withdraw any of it until retirement age (59 1/2), except under certain special circumstances (and even then, you would pay both taxes and penalties on it). But since you did say it was "long-term investment", this would be ideal for you.

I recommend you go to your nearest Washington Mutual and inquire about opening a Roth IRA. There may be an initial minimum deposit, but for you, sounds like it would be perfect.

1) Open a brokerage account at Zecco and buy the ETF DDM.
2) See below.

There a bunch of questions that you have to answer before an intelligent recommendation can be given to you. Lets start with your age and what it is you are saving for. Please read my profile and then contact me.

don't panic selling right now