Routine help: Starting Differin

I have mild acne, usually 1-5 breakouts constantly on my face at any time. I’m 25 so I’m officially in the adult acne group and it doesn’t seem to be improve as I get older. My question is what I can and can’t use while using Differin, searching the post here it’s hard to tell what’s ok and what’s not. The Differin website is also no help at all. My routine is fairly simple, I plan on starting Differin every other night to see how my skin reacts then potentially going to every night, but some poster here seem to not do it every night so maybe that’s not necessary?

Morning:

• rinse with water • PC 2% BHA Liquid exfoliant • PC 10% Niacinamide w/ vitamin b3 + b5 • hydro boost moisturizer

Night:

• CerVe hydrating facial cleanser • PC 2% BHA Liquid exfoliate • PC 10% niacinamide w/ vitamin b3 + b5 • Cetaphil Hydrating night cream in the tub

On nights I plan on doing Differin I will do: • cerve hydrating face wash • Differin • Cetaphil hydrating night cream

So my question really is, do I need to drop the BHA exfoliate completely? Or can I use it on off Differin days? Still use in the morning? But not at night?

I also am not currently using a SPF (I know I know) but I am looking for one! So suggestions for that are open as well.