No problem man, I got all of my tires put on my wheels and balanced by my brothers friend for 30 bucks then I mounted them, so I don't know a normal price for having them mounted but I wouldn't think it would be over 100 bucks. Someone correct me if I'm wrong
265= tire width in millimeters, the The 70 is percent...meaning the height of the tire from the rim to the tread is 75% of the width. the last number is the rim size.
I meant trim package ie TRD Sport, Trd Off Road, SR5, Base. That is really up to you. I have heard that skinnier tires will potentially give you better MPG. You could prolly go up to 265/75/16 if you wanted without a lift or new UCA's.