Here are some general tips for how to create larger, quality arms:
1.) Shoot for gaining overall mass if you want larger arms! This means eating a surplus of (clean) calories. As you grow, so will your arms. If you want bigger arms, you have to get bigger as a whole. Rarely do you ever see a guy with little overall mass carrying massive arms; it just doesn't work that way. Of course there are some exceptions, but for the most part, if you want bigger arms, get bigger as a whole.
2.) Make heavy compound lifts a priority in your workouts: squats, deadlifts, presses, ect.. I know it's beat into the ground around here, but squats are one of the bests exercises for stimulating total body growth. You're arms don't do any actual work, yet the benefits come from the numerous muscles you have to recruit to complete the lift. Deadlifts are also a key exercise! The biceps actually come into play here as stabilizers, contracting intensely but not over a full range of motion. Like the squat, the deadlift is a great exercise because it calls upon so many muscles to help do work.
3.) Make isolation arm work secondary. Too many times I've seen people come into the gym and head straight to the dumbbell racks to do biceps curls. Then they'll do some bar curls. Then maybe they'll do some triceps exercises. These people usually don't have impressive arms. You figure they would if they spend so much effort and energy trying to make them grow, right? Unfortunately that's not the way it works most of the time. Isolation arm work should come secondary to compound lifting. Isolation arm work alone won't get you far, but combined with hardcore, heavy compound lifting, it will. For instance, after an intense back workout, my biceps have already been taxed quite thoroughly, however, they haven't really worked over a full range of motion, therefore I finish my workouts with a few sets of biceps exercises that work the muscles through a full range of motion. If you're going to be doing biceps work, it HAS to be quality. You have to find the sweet spot with the amount of specific work you're doing and that specific work has to be as efficient as possible, otherwise you risk overtraining them. If I'm doing biceps on back day I'll do around 3-5 total sets on average: bar curls first for a couple sets, then something like incline DB curls, cable curls or preacher curls for another one or two sets, finishing with some chins. I go it by feel... if I feel like my biceps are throughly worked after just 2-3 total sets, then I stop. Go really slow on your negatives too (2-3 seconds, depending on what works best for you). Time under tension during biceps work pays off dividends.
4.) Know that the triceps are roughly 2/3 of your total upper arm mass. You want to have quality biceps, which comes from overall mass gains coupled with quality, isolation work. However, know that your triceps make the bulk of your upper arm, so the bigger your triceps get, the bigger your arms get. Make sure you don't overwork the triceps though, since they come into play heavily during any pressing movement (think about chest and shoulder training).
5.) After each set of biceps, flex them for a little bit to pump and trap more blood in the muscle. The more pumped your muscle is, the more you can "feel" what's happening to it, therefore the better quality of training you can deliver to them.
6.) Stretch them out throughly after you workout! I'm a firm believer in stretching after workouts, but for some reason, around where I live anyway, people hardly ever stretch out smaller muscles like the biceps, forearms, triceps or calves, after they've worked them. After a long period of intense contractions, muscles need to be stretched.
Happy training
