Re: leaking oil from what appears to be the prop
Your fine. It is just unburnt fuel and oil dripping down your exhaust, which mainly comes out your propeller. This is exacerbated by your failed attempts to start it but can happen after normal use as well. When you are done for the season, open up the lower unit's drain plug and see if water comes out (if you let the motor sit for a day before you do this any water should move to the bottom of the lower unit and come out first). If it doesn't then I am 100% right about the unburnt exhaust suggestion, since that and your lower unit oil is the only oil in the entire motor. If water does come out, then very little harm will be done to your motor if a small amount of water gets in there for a month or two (or until your season is over. If your season never ends, then change the lower unit oil this week to be sure).
The spark plugs are fine as well. Remember, when you kill your motor, you are really just grounding out the spark. The pistons keep turning for a few revs, without spark, but since they are still pulling in fuel and you just grounded the spark, instead of the fuel and oil burning it gets sprayed all over your plugs and drips down your exhaust.
