Have you gotten the wheels turning as far as entitlement, tract map approvals, zoning requirements? If not, that's OK, but understand that you are not squeezing the most value out of your parcel. Developing in L.A. is brutal and I have personally been screwed but learned so much that I smile about the whole thing and pass on my knowledge happily to clients. If you have gotten something underway then loopnet is good, as is craigslist. I'll post it on the MLS for a resonable fee.
I don't think now is a good time to sell anything in L.A. Especially raw land. Just my two cents.