It's hard to use an oil/cream based foundation for u're dry area's and a water-based one for the oily zones..it's better if u buy one that's made for combination skin or normal skin.
Just use u're powder where u tend to shine the most.. the powder absorbs oil (from the foundation) and could make u're skin dry.. just dab powder to u're oily area's and leave the rest of u're face out.
Stick to one skincare regime.. if u scrub everyday cut-down to 2-3 times a week