Well it seems like your to a point where some lighting will help you landmore shoots so id say now is a good time, personally I bought my first lights cause btuner was selling a couple and I had the money so I figured why not haha.
One of the best places for information is the Strobist blog and even the Strobist flickr group since all the photos there have lighting information. Just google "Strobist" and it should be the first link.
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"Thirty-six satisfactory exposures on a roll means a
photographer is not trying anything new." - Freeman Patterson