Well, I'm not sure if you are familiar with cutting and bulking cycles but here it basically how it works. You stuff yourself with healthy foods and lots of protein... 500 calories above your daily maintenance level, when you want to gain muscle. That is called bulking. Doing that will give you the bigger muscles you want in your legs and in your biceps, as well as the rest of your body.
Then there is cutting where you eat 500 calories LESS than your daily maintenance level, but still make sure you are getting plenty of protein. Combined with working out you would be able to maintain your current muscle, and trim the excess fat off of your body.
You need to decide which you want to do first. If you want to get significantly bigger biceps then you would need to be bulking, eating 5-6 meals a day to reach 500 calories over your daily maintenance level... Taco Bell doesn't count as healthy by the way, you would probably want to ditch the fast food. However, bulking will add some fat since you are eating a lot, but at the same time you will gain a lot of muscle.
Many people choose to bulk during the winter when they will always have clothes on, so that nobody else sees the excess fat if that's what you are worried about. And then you would cut before summer came around so you would have gotten the muscle, and maintained it while you lost the fat. Basically, it comes down to this. Do you want to continue putting on muscle, along with fat for a couple more months? Or do you want to maintain your current muscle and cut away the tummy first?
You can attempt to do both at the same time but as someone else posted earlier... bulking for two months and cutting for two months will produce the same results as someone else trying to do both at the same time for more than twice as long. And if you decide to cut, don't be discouraged by lack of gains in the weight room, just watch your tummy fade away

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Either way you will need to add more protein to your diet... try to get around 1g of protein per pound of body weight even when you are trying to lose fat.