Learning about the major scale will open the doors for you to learn about modes and they relations to one another.
So My advice ... get to know your major scale :)
If you have access to our online lessons here at GT, these lessons/tutorials should get you some good info:
http://www.guitartricks.com/lesson.php?input=10142
http://www.guitartricks.com/lesson.php?input=10072&s_id=249
http://www.guitartricks.com/lesson.php?input=7360&s_id=50
From there you can sink you teeth in the hundreds of lessons that show you practical application of using those scales.
You could also look at Christopher Schlegel tutorial on the pentatonic scale how you can add more notes to it to give you access to a whole new way set of possibilities in your solos.