At your age, the most important things are: cleansing, gentle exfoliation, moisturising and protecting. You want to try avoiding products that strip your face of oils. I'll mention the steps and some examples.
1) Cleansing
Get yourself 2 cleansers. One that's moisturising and gentle for daily use in the mornings and evenings.
Nivea Daily Essential Facial Wash Gel
Simple Moisturising Facial Wash
I also reccomend having at least one "strong" cleanser with antibacterial ingredients just in case you have an acne flare up. Anything with tea tree is good.
The Body Shop Tea Tree Facial Wash
Cosrx Low pH Good Morning Gel Cleanser (this one's really good, but not easy to get)
2) Gentle exfoliation
Basically, exfoliate about once every 2-3 days if your skin can handle it. But you want to use gentle exfoliant scrubs instead of something like the St Ives Apricot Scrub (basically like rubbing rocks on your face); I personally use acids and chemical exfoliants to exfoliate, but this is suppossed to be a basic routine.
Clean and Clear Exfoliating Daily Wash (still wouldn't use every day)
Nivea Daily Essentials Scrub
3) Moisturising
If you don't moisturise, you will age a lot faster, your skin will get all dry and sore (thus looking gross), your oiliness could worsen and your acne could worsen as damaged dry skin is quite prone to infections.
Some "light-weight gel like moistursers for the summer or day time use":
Nautrogena Hydro Boost Water Gel/Gel Cream (both are good, the water gel is more lightweight and suited for very oily people).
Some "Night creams":
Neutrogena Anti-Wrinkle Night Moisturiser
Pure Organica Retinol Moisturising Cream
At night is where you need to optimise certain ingredients, to achieve certain benefits. At your age, I would reccommend using something like the cream above which contains Retinol. Retinol is a form of Vitamin A which helps repair skin damage, help fade acne marks and basically prevents wrinkles.
4) Protection
Wearing SPF is the most important thing you can do for your skin. The sun plays a huge factor on skin aeging and darkening acne marks, that you simply can't miss out on this important step.
A problem many people have is finding an SPF cream that isn't any of the following: greasy, drying, comodogenic (acne causing) etc.
I have oily but dehydrated skin, so I really like:
Neutrogena Hydro Boost City Shield - SPF 25 (contains hyaluronic acid so it's very hydrating, even in the winter. Doesn't break me out either, very soft an easy to apply).
If you don't wear sun protection, then definitely don't exfoliate or use any ative ingredients (e.g. retinol). When you exfoliate, "fresh new" skin cells are brought towards your skin's surface, which are more vulnerable to sun damage; thus don't even bother having a skin routine if you don't wear sun protection.
So that's a rather basic skin routine, but it implements things like retinol and sun protection as you want to avoid looking like a 60 year old divorced chronic smoker at your age.
I'm a male, but as I had acne I take my skincare rather seriously, and thus my own routine is a bit more confusing and extensive than the one I've mentioned here. But never let anyone tell you that taking care of your face isn't manly or something. Just imagine when your 50; how will you look in comparision to all your friends who already looked like prunes when they were 30?
Feel free to ask any questions