For Indian skin type, spf of 10_15 is sufficient and if you don't want to use expensive sunscreen you can put simple calamine lotion which has enough protection. Dryness is the main issue if you are on isotretinoin you can use simple Vaseline for dryness.
Next Steps
Avoid sunexposure during 11am to 4 pm as much as possible and you can use shades like sunglasses, hat etc for sun protection.