Karl,
The equipment you describe is more than adequate for generating some interesting light curves using differential photometry. Far more important is your technique.
I can recommend a good book on the subject. See if you can get hold of "The sky is your laboratory" by Robert K Buchheim. Despite the corny title, this book covers some interesting projects on photometry and astrometry among other things. The projects are ordered roughly by difficulty, so you can work your way through it, refining your technique.
Ivan
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