Depending on the state - most will send him to jail for a bit and he will be fined heavily. Some states make a DUI a felony when driving on a summary of suspension for another.
There just simply is no better way to gain proper experience than by being a second shooter to an established working pro. Barring that, I will supply some links that might help you out some. If you strike out on your own without some good background in doing wedding photography, at least try to keep your initial wedding shoots to relatively small affairs where the pressure is not so high, and most importantly, charge NO money. No matter how large or small the wedding though, always have back up equipment. Relying on one camera body or one flash or one lens to never fail is just asking for trouble.
It is a good idea to join the PPA, the Professional Photographers of America. Insurance and tons of business help can be obtained through the organization.
It is always a good idea to get in contact with a local chapter of SCORE, which is a resource partner of the US Small Business Administration that offers free counseling and resources to people interested in starting or growing a small business. A good way to get the information and advice you need about such things as a business license, tax liability, accounting, business structure, insurance needs, etc.
Here are various items that can be of use, most importantly the section where you can obtain CONTRACTS and RELEASES:
Here is an excellent book well worth the investment:
Last but not least, here are some links dealing with wedding photography you may find helpful:
Best of luck to you. Nice to have someone here for a change who obviously has some good sense!