You are not going to get results within a week unless you roid out. But I suggest that you do burn outs with weights and that will tone your muscle and it will make it look bigger and you will look stronger. Do bicep curls.
:} buy this months fintness magazine, theres this all over body tome for your shape thing, it totally works<3How can a muscular girl get less bulky arms?
Nothing can happen in a week, lol, are you preparing for an arm wrestlng contest?
I'd say if you start arm curls you could see results in a month. Three times a week, do 4 sets of curls. Increase weight with each set and do each set to failure. Start with 5 lbs, 8 lbs, 10 lbs, 12 lbs. For your warm up, at 5 lbs, you can probably do about 25 curls. Try to gradually increase so with your heaviest and last (most important ) set you can do about 6 reps.
Other people who work out might have slightly different progressions but this works well for me.What do my muscles do this?