That's great! Take your theory in small bites at first and eventually you'll see the "big picture".
I once had a guitar teacher throw a bunch of scales and modes at me without giving me a framework. I figured out on my own that the framework was the CAGED system. Once you understand CAGED you'll see the whole fretboard and not simply one position. I put aside his lessons and now when I go back to them they make sense.
With CAGED, you learn five positions. An alternate method is three note per string scales and you learn seven positions, starting on the I, II, III, IV, V, VI and VII. I won't go too much into that, just putting it out there for future reference.
Learned CAGED first.
Don't make little dots on fretboard paper like many books do when learning a scale/mode. Instead write this the I, this is the II, this is iii, this is the III and so on. That's my advice. Then when you are learning a mode, you will know exactly which notes to change to play that particular mode.