Here are some things you need to do right away.

1) Get pictures of the bike, your injuries, the accident scene, and the other person's car (if you can).
2) Request a copy of the police report, and document any witnesses.
3) Start a diary of how you're feeling every day, pains, soreness, treatment, etc.
4) If his insurance company calls you, do NOT tell them you're feeling (good, OK, better, etc.). Tell them that you're undergoing medical treatment, and following your doctors' instructions. Do NOT agree to give a recorded statement.
5) Keep records of EVERYTHING. Every doctor visit, pharmacy bill, correspondence with police, doctors, hospitals, insurance companies (including yours).
6) Check your auto insurance policy. If you have "Med Pay" (medical payments) coverage, you may be eligible for reimbursement from your auto carrier, even if your health insurance picks up the bill.
7) If the driver was cited (hopefully they were), follow the case to make sure that they don't contest the ticket. My driver did, and I had to go to court to testify against him. (He pled guilty when we finally got to court).
8) His insurance company will want to settle this as quickly and cheaply as possible. While it's not necessary to hire a lawyer and sue, it's good to talk to a couple just to understand what your rights are, and that you've covered all the bases. Only you can decide if it's the right thing to sue.
9) Make sure that you're completely recovered before agreeing to settle - you don't want something to come up 18 months from now that's related to the accident, when you've already settled the case.
10 Get a copy of Bicycling and the Law - it's on Amazon, and a useful book to have.