One warning about the free compost available from city or county yards - it's not organic, can contain all manner of chemicals as well as bits of glass, aluminum, tires, rope, bones, etc.
My first batch was beautiful, wonderful, terrific, I couldn't stop talking about how great it was. The next batch killed everything it touched. Same thing happened to a friend and he relies on plant sales for his income. Ouch. Shut my mouth.
Compost is good, but please either know your source or make your own. The bees will repay your kindness.