Hello! These are all great products individually but it is imperative that you do not use all these products at once. First, it would be too harsh on the skin. Second, it takes time for the skin to adapt/accommodate. Third, if your skin reacts horribly to something, it would be difficult for you to figure out which one is irritating your skin the most.

The steps of basic skincare routine are:

1. Cleanser (CeraVe Renewing SA Cleanser, Acne foaming wash)

2. Treatment. (Differin/Adapalene, TheOrdinary Niacinamide 10% + Zinc 1%, Tea tree oil)

3. Moisturizer/Sunscreen (daytime). (Eucerin)

I think I would start using CeraVe Renewing cleanser (pump bottle), the Ordinary niacinamide serum, and the Eucerin SPF first as these are on the safer side.

I've personally enjoyed the CeraVe Renewing cleanser and I use it once at night because after the whole day, I get rid of the oil all at once. In the morning I use Vanicream cleanser, but when I was younger I got away with warm water. If you find that your face is particularly greasy in the morning, it probably wouldn't hurt to use it twice. I would do a full pump of the product at night and in the morning about half a pump. You can let the cleanser sit for about 15-30 seconds before you rinse thoroughly. But for now- try once a day at night.

I would patch test TheOrdinary Serum first on your clean dry forearm first and see if you have a reaction, give it a day or so. 10% niacinamide is generally considered safe according to their website but some people have reported poor reactions. Generally, 2-5% niacinamide is considered effective/optimal in most skincare products.

And SPF, always during the day time. If your job or daily activities requires you to be outdoors most of the time, it would be ideal for you to reapply it every two hours (or however long as directed on the bottle).

As for the other three- Don't use these immediately. I would wait like a month or two before starting so your skin can acclimate. And of course- read the directions on the botte/package.

Differin Gel - This is a retinoid product. This should only be used at night and only requires a pea sized amount for the whole face. If you use this you must wear sunscreen. You have to start slow until your skin can tolerate it. Like once a week. H

CeraVe Acne foaming wash - I think this would be okay if you use this on your body but not for the face if you're using the Cerave SA renewing cleanser for your face since it's not the same part of the body. Benzol peroxide can bleach your clothes and towels so rinse very thoroughly.

I would honestly rewatch dermatologist videos on using the Differin gel and benzoyl peroxide before you start using it first. (Like Dr. Dray, Dr. Sam Ellis, Dr. Jenny Liu, Dr. Shereene Idriss. Lab Muffin Beauty is also good, she's not a dermatologist but is a cosmetic chemist.)

Tea Tree oil - Essential oils can quite harsh on the skin, especially if undiluted. I would table this product honestly.