The typical beginner doesn't have the strength & power to lift heavily enough to gain muscle right off the bat. Instead of trying to over-do it why not aim for endurance with the lower weights, do it with correct form, and work your way up?
Many new lifters try to impress others by overloading the machine with too much weight that they lift incorrectly or struggle to put up. If you lift lightly and correctly then you're assuring yourself a foundation in a sense.
Of course you're going to raise the weight when the weight becomes too light (ideally when you're able to reach 15 reps or so).
That's the way I started when I first became interested in this field. Doesn't mean it's the only and correct way to do things. Each person should use the method that works best for him/her.
I assumed he had little knowledge by his first post so I told him what I'd think would be most effective for him.