Always, always moisturize. Also if you use foundation cream/primer/etc, make sure you moisturize first before applying anything. It's also handy if you can get things with SPF. I rarely wear makeup, but when I do I've found this product to be great, especially since I have super sensitive skin.
Don't forget your lip balm.
Drink lots of water (but that goes without saying, really).
Get Nearbuy - it's a nifty app for sales and deals happening in malls.