Change your CVT oil(use Toyota one), get your spark plugs cleaned, change Oil/Air filter, Break oil should be checked, if it's too dark in color then it should be changed as well, I recently used Zic A+ 5w-20, you can use 5w-30 as well.
Keep good care of CVT if you want it to last long. As far your last part, i got back view camera installed for 3500rs, go to any car electronic/audio shop and they can install it for you.