What will happen to meif Iam being sued for an auto accident that was my faultbut Iam not insured?

Since you didn't have insurance, you would be liable for the property damage to the other vehicle and personal injury claim(s) of the occupants of the other vehicle if there were injuries. 

Since you don't have any assets, the opposing party won't collect anything from you if they get a judgment against you.  If you had assets and there was a court judgment against you that you couldn't afford to pay, filing bankruptcy would be an option to prevent enforcement of the judgment.  However, since you don't have any assets, it is NOT necessary to file bankruptcy.  There is nothing to worry about because the opposing party won't collect anything.

When you are served with the summons and complaint (the complaint is the lawsuit attached to the summons), if you don't file an answer to the complaint within the time specified in the summons, the opposing party will get a default judgment against you.  This means you will have lost by default.  So, to delay the other side getting a judgment against you, it would ba advisable to file an answer to the complaint.  The answer denies the allegations in the complaint.  At the law library, look in the index of Pleading and Practice for answer to complaint.  This will give you the general format for an answer to a complaint.  The answer to a complaint denies the allegations in the complaint.  At the end of the answer is the verification which you sign and date under penalty of perjury.  The verification attests to the veracity of your statements in the answer.  File the answer to the complaint with verification and an attached proof of service with the court and mail a copy to the opposing attorney.  The proof of service verifies the date of mailing.  You can either use a court form proof of service or you can write your own.  If you write your own proof of service, it just says that you are at least 18 and the attached documents were sent via first class mail unless stated otherwise to __________ (name and address of opposing attorney) on ________ (date).  You sign and date at the bottom.  The date you sign should be the same as the date of mailing and the same date you file your documents with the court.

The court will charge a filing fee to file the answer to the complaint; however, if you don't have any money, there are court forms you can file to waive the filing fee.

If the answer is not timely filed and the opposing party gets a default judgment against you,you could file a motion to set aside the default.  If the court grants the motion, the case is then back on track and litigation will continue.