I'm in the same position; I got a teacher, and his advice was very clear. Forget about the left hand for a while, spend hours just practising different 'rolls' over and over again with the right hand, until they become second nature; the ones he recommended were the forward roll, backward roll, forward-reverse roll (sometimes called a square roll) and the foggy mountain breakdown roll (with an index finger lead). Took me about a month, and I still struggle a bit with the FMB roll. This process is boring, but essential IMHO. The notes come from the left hand, but the music comes from the right. Most banjo music, especially fiddle tunes, is arranged as a sequence of rolls interspersed with hammer ons and pull offs, so once the rolls begin to flow, the rest is quite straightforward. Tunes to try; Cripple Creek, Banjo in the Hollow (Dillards), then move on to things like Blackberry Blossom, Fishers Hornpipe, Devils Dream etc. Next stop is the more hardcore Scruggs stuff.
Good luck!
Tim