Just bought second hand lxi

Hello friends i m newbie to car arena. I just bought the 2nd hand from my cousin. Can u please guide me about do's n donts. It was the largest selling car from 02-10, the best part is its mileage I get somewhere 15-17 despite the car is 5 years old and it ran somewhere 75000 kilometers. I have driven few hundreds of kilometers, m quite liking the car. Specially the wiper feature which washes the car in front. & d best part of alto is that we can manage the car roam here and there in  very less space unlike swift n other big cars m quite enjoying the drive. The drawback may be is while driving in the rains. I cant see anything in the rear mirror. When do I service a car in 4-5k kilometers? which oil should I opt for ? which things should I kept in mind....?

Your suggestion/reviews are highly appreciated,

THANK

Mileage, best in urban traffic as it covers less spaceLess pickup in 1st gear, less legroom in rear