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I would say a good started nebula filter is a general "deep sky" or "light pollution" filter. Their transmission bands are a little wider, making them easier to use in urban areas. I don't think you'll gain too much with a narrow band filter like an UHC. These would normally be used in an already dark site where its use is very specific.
I have an O III and a Lumicon "deep sky" filter. I use the "deep sky" one almost exclusively from home. I actually see more with it.
More narrow band transmission filters home in on more specific wavelengths, like those for just emission nebula, or reflection, and planetary, but you then loose the ability to see the other nebulae these filters block.
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