ceaeser010,
some good tips are, as a beginner:
In your first games, join a squad and let your squad leader give you orders to show you what the gist of the game is.
Play either Special Forces or Assault. They are beginner friendly kits which are not complicated. I recommend you avoid the temptation of being a sniper all the time.
Download the full patch 1.41. Go here and click on "Full patch 1.41" which is at the top: http://www.ea.com/official/battlefie.../downloads.jsp
Avoid mods like the plague! The game is good enough without them to mess up online play. Only play Ranked Servers online.
You don't need the microphone with the headset; it's not essential. I have one, but I never need to use it. There are few players who actually use them because of the following:
The messages can easily be ignored.
The messages drown out other sound and is annoying if you are trying to listen to the battle.
Most people ignore them.
Most people won't understand what you are saying (I find that there are a lot of people from other countries who don't speak coherent English). You can avoid this by going for servers you know will generally only have Americans, English or Australians playing.
Trying to speak to your team members in the middle of the game is tedious and distracting.