How many times did i screw up on this hand?

[trainslayer]

I'd also like to see some responses about my equity on the flop.

I've got 9 outs to 2nd nut flush but if somebody already has the ace those outs are worthless. Do I discount them and, if so, by how much. I also have the three other 8's and Q's. If an 8 comes I'm behind Q10 so I guess I have to discount those too. Plus the three K's give me in the neighborhood of 12-15 outs. Is this close? That means my draws come in 25-30% of the time? With 5 players my equity is 20% ? I can raise for value here? I struggle w/this just sitting here doing nothing. It's a real pain for me trying to do it on the fly.