I don't know what made you "decide(d) to try" monitoring the air band, but it sounds like you're interested in listening to the aircraft comms as you watch the planes fly overhead. Many of us find that fun and interesting. But there is a LOT to learn.
Not all airports are the same.
The major airports use many frequencies: Clearance Delivery (where the pilot gets his routing to his destination); Ground (taxiing to & from the runway); Tower (take off and landing): and 'company' freqs used by the individual airlines.
Smaller controlled airports have the same freq usage, except for the airline freqs.
The small uncontrolled AP's use only one freq for everything, called a Unicom or advisory freq.
Every AP is serviced by at least one approach & departure freq. The really remote AP's use the ARTCC for app & dep. When an a/c gets high enough it will be switched to an ARTCC freq.
As mentioned by others, the best way to get started is to visit airnav.com for your local airport(s) info. That should also give you the local app & dep freqs, which will be used by the low flying airliners going into Newark. Listening to these freqs, you'll get used to the terminology used by the pilots. Also note that even if you can hear the a/c but not the ground controller, the pilot usually repeats the freq he was just given. By noting this info, you'll build a list of hearable frequencies quickly.
There are certain sections of the air band used ALMOST exclusively for certain uses.
122.4 ~ 122.9 is where you'll find many ground controllers.
123.0 ~ 123.575 can be very interesting, as these are mostly plane-to-plane chat frequencies.
128.825 ~ 132.0 is used mainly by the airlines for company info (maintenance issues, flight schedules, unruly or sick passengers).
Once you've become familiar with you local frequencies, start doing searches of either the entire air band, or smaller sections of it. You'll be amazed at how many frequencies you'll find that aren't listed on many of the Internet sites.
One of the fun things to do is look at flightaware, or adsbexchange, or whatever flight following you prefer, as you're listening to the a/c. Locate the a/c on the flight following site, and note it's location and altitude. This will help you become familiar with what frequencies are used for what areas and altitudes.
Have fun.
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