Wa Alaikum Salam and congratulations on your purchase.
No need to change coolant now, or once / twice a year. It will easily last more than 80,000 Kms. Just get it's level maintained. Still if you wanna change it, use Toyota Genuine Coolant.
Regarding engine oil, use 100% genuine and original, API SN, 5w-30, Fully Synthetic Oil, from any well reputed brand (all of these conditions must meet). If possible, switch after complete engine flush. Regarding brands; ENEOS, Total Quartz 9000, Liqui Moly and Caltex Chevron are some of the excellent and reputed options.
Shell, Kixx, ZIC may be avoided.