This is so important it has to be first. Think about what you want to accomplish, what decision you want from a local elected official, what their time lines are, what kind of public support they need to take the position you want and what you can actually provide. Have conversations with your allies about which of you has the best relationship with which decision-maker, who will approach whom when, what you have to offer. Sharing information and insights among yourselves can often be the key to success. Think about what the benefit to the county as a whole or the county commissioner as an individual is by supporting your position.
Economic arguments can be the most influential, even for environmental issues.
Create a political presence. Sometimes just say hello. You don't have to expound an opinion on everything. Never, ever lie. If you don't know the answer, admit it.