If you know how to use yahoo to check your stocks, or know anything in general about it help please...?

Question

Where would you find the price to buy one share....

on this page...

http://finance.yahoo.com/q?s=AAPL

Answer 1

That is the last trade price, currently quoted at $172.55.  It changes constantly during and after hours trading.  You will need to add brokerage commission to that.  

Answer 2

Actually it would normally be the ask price.  But thats usually only shown during regular trading hours.  The bid price is what you can sell it for.