Not sure on the oil and spewing out. Did you crank on it a lot when you were trying to get it started? May that caused an issue (shrug)
On the running issue, I would check and made sure the jets aren't clogged. Might as well go ahead and clean out the entire carb as well. Check the diaphragm for pinching or pinholes.
Is the boot new or is it the orig? A lot of issues stem from that so even if it looks ok, might be worth it to pickup another (worst case, you have a backup) or purch Thumpe's Super Boot