You can also research their endorsements. Does a candidate have endorsements from local unions, newspaper, other public servants? Do you trust the endorser?
As you continue to vote and follow these local elections, you will get better at learning about them. The best thing to do is to be involved yourself. If you become active with civic organizations, you’ll be more connected to what is happening with local leadership (churches, cleanup groups, food bank, trade groups, etc.). Basically see if you can volunteer wherever you usually donate locally.