How to treat leather on new bag

I thought I need to apply some waterproofing to it
I don't waterproof mine, I find that the leather is quite resilient and I live in Vancouver. Having said that some do elect to spray a waterproofing product on their bags, especially if they have a lighter coloured one. Leather Honey would be the wrong product for sure. There are quite a few waterproofing sprays, that would be all you'd need I would think, if you choose to go that route.