Since you can play many songs, it seems you already know scales. Just that you do not know that you know scales.
Scale diagrams are available all over the internet, and it would just be an exercise in futility pasting them here again.
With scales, the best way I have found out to practice is to put some backing tracks from guitarbt [dot] com, and play scales alongside them. It gives you a sense of the scale(root, 5ths) and also a sense of rhythm.
My gear, currently up for sale
Washburn X-16 anarchy - SOLD!!
duncan pickups - I wonder why Im selling these.