as mentioned above w/ time you'll hone in on what is working for YOU and what isn't. Arms are one of the first body parts we build great mind-muscle connections with. it's easy to see and feel the arm flex, wherein learning the difference between a contracted lat vs contracting different upper back muscles takes some time.
i by no means have huge arms but for my size and frame they are doing pretty good. intensity and progressive weight increase and/or volume increase w/ variance in rep schemes and order of exercises helped a lot. i classically over trained arms w/ too many exercises too much frequency when i began. that being said, the "over doing it" helped me to learn/connect w/ the arm well.
i find now rather than too much volume, i need to go heavy early then w/ fewer exercises total, add drop sets or other things to increase my total reps per set. heavy load vs chasing a pump need their balance. i find for ME now, i need volume to really get the pump/blood flow i desire. but more volume it terms of reps not total exercises.
lastly, finding the right core group of exercises that build muscle for YOU is key. kick the shit out of your triceps, my tri's can handle more volume than my bi's. heavy overhead movements for the long head fatten up the arm nicely, dips (weighted or machine), and heavy press downs varied w/ volume style (less weight) adherence to form work nice for me.
I also like heavy hammer curls, pinwheel style, and high volume preacher curls (plate loaded machine using drop sets) for biceps.
**** oh i train them once a week but cycle through the order of my workouts, if i hit arms but didn't feel like i did enough "damage" they become priority part for the following week, effectively then they are trained twice within a set a number of days. i like arms to be their own day but sometimes, again, if the feeling was that i didn't "get em'" good enough, i might add some bi's again in the week after back, or tri's after chest, or the converse of that chest/bi's -back/tris.