What to do

What to do

I have three kittens I took in from the outdoors a couple of weeks ago. They are approximately 10 weeks old now. I was wondering if anyone had any training ideas. Currently I am keeping them in one of my bathrooms. They like to get into things, and I am worried about what could happen to them. One has already fallen down a heat vent (the vents were not screwed in and they knocked if off somehow) and crawled out of a very narrow vent on the opposite side of my house. Anyway, I let them roam in one of the bedrooms for a little while and they tended to go towards cords, etc. How can I prevent them from chewing on them!? Right now they all have their claws and are not fixed yet, but I plan to have this done ASAP (pending when their testicles drop and are able to be fixed). All three are males. I was wondering if anyone has any advice!? I am new to cat ownership, as I have grown up with dogs only and don't know much about cats and training them! Thanks much!