Undecided Question

What are your staple skincare/makeup products–essentials only?

im 21 yrs old and i've been pretty bad about taking care of the skin on my face. im new with makeup and i want to be able to look my age as well. people mistake me for high school age. i like the versatility i can get with that but i need to know what to look for so i can start painting my 'mature' face haha. what are good starting products to buy? i dont want to go out and splurge on something that's probably part of details. i need to get basics first. suggestions?