Campaign materials and newspaper articles. In the US, it's pretty rare even for small communities, not to find at least some of this information online.
Thank you for mentioning experience. Voting on local elections is basically being in charge of a job interview. In a lot of cases, their stance on policy issues matters far less than their ability to do the job well.
I would look up your local paper specifically, if you haven't already. They aren't always going to show up in search results.
My local paper often does a brief "meet the candidates" piece for the city council, so you may find the same. Although they won't have everything all the time