Let it run on full choke for a bit before you blip the throttle. The idle should gradually rise as the motor warms up. Most of my old carbureted i-4's would idle up to 4k on full choke, then drop to half choke and let them idle up to around 3. After that it was usually ok to pull the choke off and ride normally, ymmv. I don't think its weird to have a little oil there, the whole bottom end of the motor is bathed in oil so its bound to get near the starter. As long as its not coming out onto the ground I'd say you're good.