Help a clueless girl out?

I consider myself in fairly good shape but all I've focused on over the past couple years is cardio. My usual gym routine is running 6 miles (6mph pace) then using the elliptical for 45 minutes. I'd say my endurance has definitely built up over the past year, but I've got some flab on me and not a lot of muscle tone. I'm 5ft 3 and 107 pounds (BMI 19).

I'd love to start building muscle and getting into the best shape possible. I'm a bit clueless though on what areas to train, how many reps to do, or even how many calories I need to eat. I don't want to under eat but I also don't want to put on fat. I have no problem gaining weight if it's muscle.

Any advice on where to start?

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