I gained the Freshman 10...

http://startingstrength.wikia.com/wiki/The_Starting_Strength_Novice/Beginner_Programs

If you want muscle tone isometric exercises are the way to go.

FInd your Total Daily Energy Expenditure here: http://www.fitnessfrog.com/calculators/tdee-calculator.html
and add 500-1000 calories to your TDEE if you want to gain muscle

I have these and would definitely recommend the author's other two books if you're serious about weights:

Starting Strength (explains the different exercises in the Starting STrength program and about exercise in general)
http://www.amazon.com/Starting-Strength-3rd-Mark-Rippetoe/dp/0982522738/ref=sr_1_1?ie=UTF8&qid=1353391687&sr=8-1&keywords=mark+rippetoe

and
Practical Programming (more on starting strength and nutrition)
http://www.amazon.com/Practical-Programming-Strength-Training-2nd/dp/0982522703/ref=sr_1_3?ie=UTF8&qid=1353391687&sr=8-3&keywords=mark+rippetoe

Weights won't make you bulky unless your calorie intake is too high and free weights are A LOT better than circuit machines (without getting into neuro-muscular connections, the thing to take away is you don't use your muscles separately, so why would you train them separately?)

Good luck!(: