What should I buy first?

I have $50 and I have been dying to buy some mac makeup forever! I'm finally going to the mall tomorrow but I don't know if I should get some things from mac, or buy the clinique 3 step skin care system (I have breakouts, redness, and visible pores) and I've heard tons of great things about it. Please keep in mind that I'm a younger teen and it took me 4 weeks to get $40