my suggestion (and talking from experience)

1. take pics of the incident and the vehicles still on the scene, yung hindi pa nagalaw. don't forget to take pics of the plate number of the other party (so that you can check it on LTO online if their vehicle is unregistered or not)
2. give a photocopy of drivers license and get a photocopy of the DL of the other party (also you can check if it is expired)
3. photocopy of insurance -- you give yours, you get the other parties' ... para hindi na mahirapan insurance company mo maghanap kung ano insurance policy ng other party.
4. contact numbers of the other party, and if possible, celfone of the police investigator who created the police report (you'll might need this in the future)
5. original police report (or a certified true copy would suffice) - requirement for insurance claim
6. if the other party is hospitalized, keep all official receipts (hospital, medical bills, etc) that is related/named to the other party. you can reimburse it at your insurance (covered in comprehensive - bodily injury)
7. have an estimate of the other party's vehicle damage. they might give a bloated estimate to your insurance company (compre - property damage)
8. if the other party doesn't cooperate accordingly, try to settle with them (give danyos) and have them immediately sign an affidavit of desistance (para wala na silang habol sa iyo)
9. if you still have problems with the other party, it would be better to get an "adjuster" (usually your insurance company assigns one if you would request for it) to act as a liaison officer between you and the other party

hope this helps!