If you want them charged criminally, then file a complaint at the local police station where the incident happened. But as mentioned the police may decline to get involved. You can also complain to the club owners and they may or may not discipline or fire the bouncers.
If you want money, then DOCUMENT your injuries. Best thing is to go to a doctor and get copies of the medical records, take pictures of the injuries and label them.
As mentioned unless your jaw is seriously messed up you won't have much damages that a lawyer would be interested in taking on a contingency basis.
However, this would be a decent case for small claims. You could name the all of the bouncers and the club as defendants, but you may have trouble in getting the names of, serving, and collecting from the bouncers, so I wouldn't bother. Just file a small claim naming the club as the defendant (make sure you use the LEGAL name, which is probably not the name of the club; find out the owner!) and sue them for $3,000. Claim your out-of-pocket medical expenses (keep receipts!) and claim the rest as pain and suffering and loss of enjoyment of life. Have your brother file the same at the same time and you should get identical trial dates. When you get your trial date, go to court with your records and it would help a lot to have friends come as a witnesses too. Each of you can testify on your own behalf and for each other, as well as any other witnesses. You could win a total of $6,000 between the two of you.
It's very likely the club will offer to write you a check for less than that outright rather than bother with court, if you really have this kind of a case. You do not need an attorney for small claims.
See
http://www.judiciary.state.nj.us/civil/civ-02.htm for more details.
Needless to say you will be a persona non grata at the club after this.