A knick in the blade will be alright so long as it isn't too big. I flew mine like that for months.

If your dad has the same frequency and the same brand if transmitter, yes, you can use his.

I suppose if you put your receiver in there it will work fine. Just make sure it's not too big/heavy. But the Blade CX comes with a rx and tx. I would just use that combo. Don't fix it if it ain't broke