My arms are my best feature and I don't train them nearly as much as larger muscle groups.
Prioritize the training of your back, shoulders, and chest. Your arms will get a lot of stimulation by training those larger muscle groups. Then you can supplement your arm training with specific arm exercises that allow full range of motion, which you often don't get while training back, chest, shoulders.
But I would recommend keeping the volume fairly low unless you just have great genetics and can deal with it. But I've often found that less is more as long as that "less" is very intense and efficient.
For example: Say I wanted to work chest and back on the same day... After I've completed my back and chest training I may have done something like 10-15 sets for back and 10-12 sets for chest.... Then I might do some supplemental arm work, but since my arms have already done a lot of work I don't need a lot of supplemental training. At this point I'm just looking to do a little bit of a full range of motion training. I may only do 2-4 total sets of triceps and 2-4 total sets of biceps. But remember that my arms have already done a lot of work while training my chest and back.
When I was younger and very interested in how my arms looked, I usually trained them by themselves. But eventually I discovered that I got more out of my workouts if I just did supplemental arm training after training larger muscle groups.
So again, focus on your larger muscle groups and supplement that with a lower volume of arm training. Less is more. You should get more response out of your arms than you would if you train them alone on their own day. As I've gotten older, training arms on their own day makes as much sense as training calves on their own day. Sure, you can do it that way, but there are much more efficient ways.
The muscle mass found in the chest and back is multiple times the amount found in the biceps and triceps. Train accordingly.