Your workout routine

You need to examine your goals, be it getting bigger, stronger (which aren't maximally related) or what, and tailor your diet and workout routine accordingly.

Free weights are always always always better than machines, provided you do the lifts correctly. Squats are the single most important exercise you can ever learn to do.

The absolute main reason the majority of skinny guys can't gain the weight they'd like to when they start pumping weights is because they aren't committing themselves to the kind of diet necessary to support that kind of mass building.

The most successful dietary change I've heard of is, outside of retooling an entire diet (which I'm not going to go into here) is adding a gallon of milk to your diet every day. Seriously. A jug of whole milk. It's one of the cheapest sources of good protein you can buy, and its carb/fat/protein ratio makes it convenient since you don't have to measure shit, you can just drink it. For skinny guys who are just starting to train, it is more effective than steroids (and also you're not a total moron if you drink milk).

Jam it back in, in the dark.

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I don't know what your goals are, but if it's to gain strength you need to rethink the way you approach weight training. You want your work sets to be somewhere in the neighbourhood of five reps, at the absolute maximum weight you can manage.

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That's why I started with "I'm not sure what your goals are." The reason most people push weights is because they're looking to increase strength, an end toward which low-weight high-rep sets are not the most efficient path.

If you don't exercise, and then you start exercising, of course you will have results. I'm just saying, depending on your goals, certain ways are more efficient at achieving them than others.

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