Lack of written policies is a major problem. Even if you have written policy, the courts will hold you liable for "common practice," if that is contrary to written policy.
Anything involving, arrest, search, siezure, evidence handling, use of force, or the potential for loss of life or injury to anyone needs to have something on papaer about how it is done, and the paper needs to be enforced. That doesn't mean that policies have to be overly complicated or can't rely on common sense, but your agency will lose criminal cases (ex-you need a written policy about vehicle inventories to get legally "keep" evidence found during inventories), will have tremendous liability, and inconsistent application of resources, which will effect your community relations.
I have written lots of policies in the last few years, and our agency is going through the accreditation process with CALEA right now, so I am in the middle of several more policies. CALEA is proving to be a real pain, but it is forcing us to re-look at what we are doing, and think about things that we do not normally worry about.
I suggest that you approach the Chief about these issues from a liability and investigative standpoint, and offer a solution (new policies). If he buys off, though, you will have inherited a major project in writing this stuff.