Short answer, in order of importance: nothing/"listening" to my skin, aloe, exfoliators (Bliss or Clarisonic), diet and exercise, hats, Hope in a Jar by Philosophy; vitamin C serum by Timeless (tied), oil cleansing.

TL;DR answer:

Since I have experimented so much, I will be happy to share my advice, but I think skin is very unique for each individual and there is definitely not a one-size-fits-all approach. My philosophy is that skin just wants to be healthy. That means do not interfere with it too much. It needs to "do its thing" and your only role is to help it along and feed it nutrients. So, I do not follow a strict routine. Every morning when I wake up, I assess "What does it need today?" and then I have a collection of products and tools to address any issues.

For me, specifically, my skin likes certain oils and oil cleansing (I have used DHC, but when this bottle runs out, I will probably switch to Burt's Bees version as it has good reviews - these are pre-made oil cleansers that have emulsifiers which allow it to rinse cleanly without "double-cleansing"/following with a cleanser). Rosehip oil is a favorite for after cleansing and you can add a drop to your moisturizer if you use/need one and feel you need a boost of vitamins or moisture. My skin also likes regular exfoliation either through acids (mine likes AHAs like glycolic or lactic acids) or with my Clarisonic. I try not to over-exfoliate, but for me, exfoliation is the key to my skin's biggest woe -- clogging and texture. It responds very well to fresh aloe, all year round, for soothing redness and providing moisture and nutrients. If ever I were asked as I age what I did to have nice skin I would say genes and aloe. I don't wear makeup or sunscreen unless it is especially warranted (i.e., special occasions for makeup and the beach for sunscreen). I do wear hats and large sunglasses, however. I live in a very sunny climate. I try to eat nourishing foods, foods with oils like fish and Brazil nuts, vegetables. Get good rest. Exercise, even mildly, dancing or stretching to increase blood flow.

Maybe it's a little much, but that's my approach to skincare. There is more advice from others at the /r/skincareaddiction sub. I followed a routine from there once and I liked it but I'm avoiding parabens now and just doing my own thing again. Products they recommend that I like include the CeraVe Hydrating Cleanser which I still occasionally use as well as a paraben-free similar-style cleanser (very creamy, very moisturizing but leaves no film) by La Roche Posay. For moisturizer I use Philosophy Hope in a Jar. I am looking for a paraben-free alternative, but this is a fantastic moisturizer and if I wanted to only answer your first question, this is what I would say. It sinks in nicely and does not feel like you have anything there. I like using masks after the shower to allow them to really get to my cleaned skin and tighten the pores. Finally, and probably the only real anti-ageing thing I use is my vitamin-c from Timeless, only ever at night, only a few times per week. I store it in the fridge to keep it from oxidizing (keep it closed tightly and away from light). This is a new addition for me as of this year and I like the effect, I really do see a difference (brighter skin, possibly more plump, especially the following day). Given my philosophy, I think everything in moderation.