I highly suggest you check out this e-book by Martin Lass! http://www.martinlass.com/99_Master_Secrets.htm

This book totally revolutionized the way I approach learning instruments.

The best advice I can give you is to join a band or just start playing with other people. It's more motivating and playing with other people is just a lot more fun. I have days where practicing makes me want to fall asleep on my instrument, but I'm learning music I love that I'm really excited to play with people, I can practice for hours without even noticing it.

Also, just be patient with yourself, and try not to demand too much from yourself too soon or you'll get burned out (easier said than done soemtimes :) ) It's better to set standards that are too low and find tha you wish to increase your practice time than to try to keep up with a crazy practice schedule before you are ready.