Generally, you'll want to adjust the height so the tonearm is level when it sits down on the average record. You might want to experiment to fine tune the arm height to your listening preference. Usually level or with the fulcrum a tiny bit lower than the headshell is desirable.
If you don't want to get into a lot of money, Audio Technica's own record cleaning kit is very good. My local needle/turntable guru recommended it over many similar other ones. He said the AT brush has finer filaments and scrubs out the groove better. AT's replacement cleaning fluid is rather expensive, but you can find plenty of excellent, less expensive replacement cleaning fluids here and many other places (Needle Doctor, MusicDirect, Acoustic Sounds, etc.).
I believe the the PL-120 comes with a cartridge alignment jig, which should get it close enough to get you going. Another alternative is to access the alignment protractors at Vinyl Engine here. Since the PL-120 is such a close copy of the Technics SL1200, I suspect you can use the Technics protractor on this page. Otherwise, just use one of the universal protractors. Make sure you set your printing preferences to "full size" or "100%" when printing it out, because accurate scale is everything with alignment protractors. Vinyl Engine includes instructions for many of these.
You should get a lot of enjoyment out of that rig. Not only are the PL-120 and 2M Blue two of the better components at their price points, that turntable and that cart work together particularly well.
If you don't want to get into a lot of money, Audio Technica's own record cleaning kit is very good. My local needle/turntable guru recommended it over many similar other ones. He said the AT brush has finer filaments and scrubs out the groove better. AT's replacement cleaning fluid is rather expensive, but you can find plenty of excellent, less expensive replacement cleaning fluids here and many other places (Needle Doctor, MusicDirect, Acoustic Sounds, etc.).
I believe the the PL-120 comes with a cartridge alignment jig, which should get it close enough to get you going. Another alternative is to access the alignment protractors at Vinyl Engine here. Since the PL-120 is such a close copy of the Technics SL1200, I suspect you can use the Technics protractor on this page. Otherwise, just use one of the universal protractors. Make sure you set your printing preferences to "full size" or "100%" when printing it out, because accurate scale is everything with alignment protractors. Vinyl Engine includes instructions for many of these.
You should get a lot of enjoyment out of that rig. Not only are the PL-120 and 2M Blue two of the better components at their price points, that turntable and that cart work together particularly well.