You could do what you're doing if you wanted to. If going into a gym and doing 4 sets x 37 reps of dumbbell curls followed by 4 sets x 13 reps of bodyweight squats is what you wanted to do and helped you get to your goal, no one can tell you wrong.
However, I would suggest finding what your goal is. What is it do you want to accomplish in the next 6 months in the gym? How about the next year? 2 years? Figure that out and go from there.
You called yourself "lanky" so I assume you probably want to be more muscular (what guy does't)? Also, strength is great to have too. Who wants to be a weak guy?
In general to get bigger and stronger, follow a proven method to accomplish instead of writing your own programs. Do this for several years before tampering with anything. I would start by researching and reading about "strength training." Fundamentally, it is where it all starts. Some great places to start are:
-5/3/1 by Jim Wendler
-Starting Strength by Mark Rippetoe
-Dinosaur Training by Brooks Kubik
-Easy Strength by Dan John & Pavel