this site has a tuner you can use if you down load it. you can buy an electric tuner for $20 or less. you can also tune the guitar to its self to do this you need to start on the low e string (the thickest one) at the 5th fret, play the note then play the open a string, tune the a string until it matches the pitch. continue on the other strings until you reach the b string (second thinest) then its the 4th fret on the g string then back to the 5th fret for the high e. im more than sure there is a few lessons on tuning on here.
They say the END is near, but I'm Tired of waiting.