Be sure you're ready for your new addition before you bring her home.
Most kittens do well at regulating their calorie intake, so it is okay if fed free choice.
Canned food, however, should be fed at specific times and picked up if not eaten within 30 minutes or so. If you notice your kitten is getting too chubby then cut back on the amount you're feeding her. She should be lean and not chunky. Fresh water should be available at all times. Litter Provide a litter pan and insure that she can climb over the sides.