A private (meaning, non-public) field like this one probably uses the multicom frequency, but yes. Self-announce on the CTAF. Irks me a bit there aren't runway numbers.
Gives you a rough magnetic heading so you can line up easier and keep your pattern straight. Also to tell others which way you're going to keep from crashing head-on (a north/south strip might be 36/18, for example, so ppl know which way you're going).