Im a total newb too, but this has helped me some. My gym has stationary bikes with RPM counters. Im guessing thats the same as cadence? Anyway, I go to the gym to run but I'll hop on the stationary cycle to warm up for a few minutes and focus on keepin gthe RPM at or above 90. Then I try to "memorize" how that feels. Sorta like a rythym, and tell my legs "ok legs, this is it!" When aI get on my bike I have more of a feel for how my cadence is. Also, I dont know if you are clipless yet, but that really helped keeping the cadence up w/o slipping off the pedals. For me anyway.