Honestly IMO, with getting your arms bigger - I think LESS is better.. I'd been off lifting for a few yrs and my arms were kinda small.. But I got back into it w/ just a really basic workout on bicep days.. 4 sets of straight-bar curls.. The 1st was just a semi-warmup, but the next 3 would be sets where you gotta give it your all to get that last rep out, with the last set only getting possibly 7-8 reps.. My max kept going up week to week, and I've definitely seen some size increase in the past couple months..
Next week I'm gonna be stepping my workouts up a bit, but still for arms is only gonna be 2 exercises - barbell curls and then dumbbell hammer curls.. Just doing 3 sets of each with as much weight as I can handle to do 10 reps..
Since biceps don't really seem to get very sore after a workout, alot of people will incorporate too many exercises and do them too frequently - and this IMO is a reason why they don't get that big, but just rather more toned.. So that's why I just say hit them hard and then give em a week off..