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I checked out that site and you will need a variety of different dumbell weights depending on the exercise.
I would start out really light at first and focus on good form to isolate your arm muscles. I would start at around 10 to 15 .lbs per dumbell. As you you progress and gain strength, add a little more weight like an additional 3 to 5.lbs. You will find that different exercises will be easier than others.
My targeted number of reps is typically between 10 and 15 in sets of four.
The biggest mistake is when people start out with too much weight, which leads to bad form, which can lead to injury.
In addition to dumbells, pushups and dips are helpful to build arm strength.
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