Trying to replace switch and outlet

I've managed to replace other switches in the house without a hitch but I tried a gcfi switch in the kitchen and it burned out our lights over the sink, recently decided to give it another shot in our downstairs bathroom with an outlet and a light switch, I removed the old ones and it appears they both have too many wires that I don't know where to connect them, now that they're not connected, the light next door in the laundry room isn't working