How can I get arms like Kim, from the band matt and kim?

http://www.youtube.com/watch?v=4Yg-CgIwaHs ok this girls has awesome buff arms. Exactly like what I want.

What I already am doing:

Dieting, have about 10 more pounds to lose to hit my ideal weight, which I am on track to reach in 5 more weeks.

Cardio, I try to do some form of Cardio 30 minutes at least a few times a week.

Weight training, I do a bicep curl and a tricep push down at 20 pounds for 3 or 4 sets of 10 or 15. As well as a deltoid curl, which I can barely do any. I do as many as I can with 10 or 20 pounds, it is a really small number so far. I am trying to do these 3 times a week, but I don’t always have access to the gym when it is open these past few weeks, crazy stuff with work going on. Anyways, 3 times a week is my plan.

So what should I add/modify to my routine to get to the goal of muscle tone like we see in this music video? Also how long do you estimate it will take. It doesn’t have to be quick, I know it won’t be, but I find it super helpful to have a time in mind when a goal will be achieved, it helps me to be much more motivated to finish something.