Undecided Question

How do i find out whether i have oily or dry skin !!!?

I am not amtuer with make up. Well I kinda am , but i know like all the tricks and stuff.. I give my friends advice etc.. as I watch many youtube beauty guru videos. Anyway, I wear eyeliner and eyeshadow lip gloss and stuff like that but I am starting to wear foundation. I want to try this new foundation, but first I have to find out whether I have oily or dry skin, it may sound stupid to the make-up or skin experts that I am asking this, but I really need to know? Obviously Icannot send you my skin in a most, so could you possibly tell me some ways of finding out without me going to the like a makeup artisist or something. Thank you so much guys ! The best answer gets 10 points, if am allowed to give it to them. Again, thank you so much have a nice day/night :) x