1.  Get medical help.  If you have been injured, you need to be healed.  You should use your own health insurance, or your "med-pay" provision under your auto insurance coverage. 

2.  Get the name and address of all witnesses and people involved.

3.  Get the driver's license and license plate of the other vehicles.

4.  Take photographs of the damage to your vehicle, motorcycle, bicycle, and the injured areas of your body.  Also take photos of the location where the accident occurred from several angles.

5.  Keep records of your out-of-pocket expenses such as receipts and logs.  If you lose time from work keep notes of the dates and hours missed.

6.  Insurance companies do not gladly part with their money, especially when you really deserve it.  Be aggressive and a good record-keeper, and contact an experienced lawyer. 

7.  Is a lawyer expensive?  A personal injury lawyer usually takes the case on the "contingency" that you receive compensation.  They are not paid unless you receive a judgment or settlement.  Contingency fees generally range from 1/3 to 45%. 

8.  Act quickly!  There are statutes of limitations that may prevent you from receiving your settlement, for instance, claims against public entities must be made within 6 months of the accident!