EMERGENCY HELP! OIL + Doh! moment = Sh!t

[Supra Saiyan]

My 88 supra n/a m/t (no mods) is in question here..
First I filled the oil up, oops to much, maybe 1 cm over the full line. Drove it like 20miles (hard)..
Doh! Now I have nasty smoke coming out the back. It's just the oil leaking from somewhere near the back left of the motor (facing it from a deer's point of view, or outside in), I guess near the bottom of the manifold area. Anyhow, oil I found dripping out of the area (I cannot see it due to the heat shield, or whatever the big piece of metal blocking my view). It drips down right to the ground. Well, at least I guess it's some of it. The rest gets burned off and comes out the back white smoke! It even smells like burning oil.

Do I simply drain out the extra? How do I do that? Where is this leak actually coming from since I over filled it? Should I just get an oil change? It was due in another 1000 anyways. Any ideas to any damage I may have caused?