Needing a full drugstore routine!

I'm 34 years old and have never put much effort into my skincare. It's starting to show and I want to change!

For background, I have combination skin. My noise is oily and I use differin on it nightly per my dermatologist. The rest of my face is pretty dry with the occasional pimple on my chin. I have dark circles and beginning crows feet. My skin looks super dry by the end of the day (especially in the winter) and my foundation starts to flake regardless of what I try.

I use Johnsons baby shampoo as my nighttime cleanser (I know eek), Paula's Choice 2% BHA 1-2x per week, Mary Kay eye serum under my eyes maybe 4x per week, and either Olay Vitamin C Serum or Jergens body lotion as my moisturizer for day and night. My foundation usually has sunscreen depending on what I pick.

What do I need and what should I drop? I don't want expensive products, but I don't even know what types of things I need for a solid routine.