[Routine Help] In what order should I be using my products? and more

Hi, so I'm new to skincare. I think my skin type is a combination since my forehead and nose are somewhat oily, and my cheeks and other areas are usually dry. My current routine is:
Cetaphil Gentle Cleanser ---> Axis-Y Dark Spot Correcting Glow Serum (For my acne scars/trying to get rid of the hyperpigmentation, which I'm not completely sure if that's what it is) ---> CeraVe Daily Moisturizing Lotion ---> Round Lab Sunscreen (Morning)
So, a couple of questions I have are

1. Is my order of products correct?
2. I'm thinking of buying The Ordinary Salicylic Acid 2% Solution for the sebaceous filaments on my nose.
   Is it okay to use it with my current products?
   If it's okay, how should I incorporate this into my routine? Such as before what product and how often should I/can I use it?
3. How long should I wait in between each product before applying the next?
   If you have any other recommendations or concerns please let me know, I'll gladly appreciate it ;D